It's not like Naruto was full on horror story, but it does have some truly scary moments. Despite the author wanting it to be more lighthearted, we might still get some moments that will prevent us to get some sleeps.
Unmarked spoilers below!
Manga
Part I
Chapter 10: My Story!!- After killing Momoshiki Boruto suddenly has a vision, where he sees the Otsutsuki again, and he tells him that his blue eyes will take away everything he has one day, while also leaving a mysterious mark on his right hand.
Chapter 12: Friends..!!!
- After a whole chapter spent to build Tentou and Boruto's friendship, it is revealed that his personal butler is actually dead and that the man impersonating him is the Leader of a Band of Thieves famous for stealing PEOPLE'S FACES. That means he wears the dead butler face INSTEAD of his own. Thank you, Boruto.
- The next chapter expands on how this is done: Brain Food.
Chapter 17: Vessel
- Kara, a new evil organization shrouded with mystery with an unknown purpose.
Chapter 35: Vessel
- Jigen, the leader of the Kara Organization, was the partner of Kaguya Otsutsuki. Like Momoshiki and Kinshiki were. It even seems that Kaguya was the inferior one of the duo. And this guy is leading Kara!!!
- Worse still, Sasuke discovers something that scares him: Jigen has a miniature version of the Ten Tails under his control!!!
Chapter 36: Raid
- Jigen uses Kawaki's own Karma to invade the Uzumaki house and from the looks of it, he's more than a match for Naruto.
Chapter 39: Proof
- If what Jigen says is true, he plans on turning users of Karma into vessels for the Otsutsuki, which means he will turn Boruto into Momoshiki!
Chapter 43: Manifestation
- After Sarada manages to land a blow on Boro, destroying the core that keeps his Scientific Ninja Tool in check, he starts swelling up like a balloon. But even then, he still won't die! That is until Boruto uses his Karma boosted Rasengan to finally destroy him. But... something is off about the boy. He grows a horn and his personality seems different. Almost like... Momoshiki Otsutsuki.
Chapter 46: True Identity
- Amado reveals what Karma really is - a compressed back-up of the Otsutsuki's biological data implanted into a target (as well as, somehow, allowing their soul to move to the new body as well), allowing the Otsutsuki to resurrect themselves by overwriting the victim's genetic information with their own, and transcend death. In other words, Boruto will literally become Momoshiki via Grand Theft Me and Clone by Conversion. What's worse, one of the few ways to prevent this from happening is to kill the host before Karma has fully manifested.
Chapter 48: Time Limit
- Isshiki has returned and is poised to destroy the Hidden Leaf Village and everyone in it to get Kawaki.
Chapter 51: Sacrifice
- As Boruto is poised to commit suicide, Isshiki shrinks his kunai and tells Boruto why he's been given the Karma: to use him as a sacrifice to the Ten-Tails, creating another God Tree, which would then annihilate all life. At this point, Boruto's just learned that he's either going to have his consciousness overwritten by an unimaginable evil or get eaten alive by a creature who will use his nutrients to bring about the end of the world, and his only chance of preventing this is his own death. So much for that promise of lightheartedness.
Chapter 53: That's reality
- Just when you think all is well after Isshiki is defeated, Momoshiki takes over Boruto again and stabs Sasuke's Rinnegan, before declaring he will kill him, Naruto and Kawaki.
Chapter 54: Bro
- Boruto manages to regain control of his body thanks to Sasuke and Kawaki's efforts... but Naruto has lost consciousness.
Chapter 55: Legacy
- Don't worry, Naruto doesn't die...but Kurama does as a result of the Baryon Mode and he didn't tell Naruto this because he knew he would outright reject the idea. Kurama's death also means that Naruto has become significantly weaker now.
- It turns out that Isshiki had one last backup plan. He planted an inferior version of Karma into another member of Kara, Code, and he tells him to finish what he started.
Chapter 64: Control
- After using the power of the karma to an extent he never used before thanks to Amado's meds, Boruto suddenly collapses on the ground, holding his chest.
Chapter 65: Karma Power
- Momoshiki takes control of Boruto once more, and this time, he can absorb how much chakra he wants, unlike last time.
- Naruto is faced with one of his worst nightmares, having to fight his own son who is under an alien despot's control, and there's seemingly no way out of it.
Chapter 67: Rift
- After Momoshiki resurrects Boruto using the Karma, he explains that because of it, he is now 100% pure Otsutsuki. He notes that Code will realize this soon, and that being 100% makes Boruto a preferable target for sacrifice compared to Kawaki.
- As if that wasn't enough, Momoshiki also tells Boruto that no, his close call with death had nothing to do with the grim prophecy he foretold him the first time, and laughing, he promises him that while he doesn't know how it will come about exactly, the event is getting close, and that it will be a "true spectacle".
Chapter 75: The domain of gods
- Amado reveals that the abilities of Eida and Daemon come from a new Otsutsuki, Shibai Otsutsuki; a being that successfuly attained godhood after continiously eating chakra fruits and cheating death with the karma, to the point that he could seemingly just abandon his mortal body and Ascend to a Higher Plane of Existence.
- Boruto suddenly gets to experience a flash to the future, and it doesn't paint a good scenario: the ninjas of Konoha are pursuing someone, and team 10 is seen confronting someone, with Shikadai chastising that someone, even Mitsuki, someone that rarely gets angry, is seen enraged and in sage mode. And lastly, we're treated to a shot of kawaki looking down someone, with blood on his right cheek, and the karma activated to the same level he used against Momoshiki.
Chapter 77: Time Drawing Near
- Kawaki has decided that the only way to protect Naruto is to destroy every last Ōtsutsuki... and that unfortunately now includes Boruto, since he's become genetically one due to Momoshiki's Karma and he believes the latter could take over Boruto at any moment. Despite Naruto and Hinata opposing his decision, Kawaki sends them away with the Karma Rift to keep them from interfering.
Chapter 78: Super Idiot
- Kawaki proceeds to attack Boruto and manages to slash the latter in the right eye while Boruto was protecting Sarada from his attack, giving him the scar that would be seen in the flashforward. Momoshiki then tells Boruto that the prophecy he foretold is just about to begin...
Chapter 79: Omnipotence
- When Kawaki laments that he's a nobody who won't be missed should something happen to him while Boruto is the Seventh Hokage's son, Eida's power proceeds to grant his wish by altering the memories of everyone on Earth (with the exception of Sarada and Sumire, both of whom are somehow immune to Eida's entrancing power), making people think that Kawaki is the biological son of Naruto and Boruto is the adopted child who betrayed his family and tried to kill Kawaki. Everyone who was hunting down Kawaki is now going after Boruto, with Mitsuki even going so far as to attack Boruto with the intent to kill. The situation goes From Bad to Worse when Kawaki tells Eida to lie to everyone that Boruto killed Naruto and Hinata.
Part II/Blue Two Vortex
Chapter 2: Tree- The Claw Grimes show just dangerous they are when one bites Soegi and forms a tree around him. These Claw Grims will keep attacking people until they absorb an Otsutsuki.
- Boruto warns Code that his tampering with the Ten-Tails is making it more dangerous than it already was and tells him to put a stop to it now while he still has control, but Code refuses to take Boruto's warning seriously.
Chapter 3: Uzuhiko
- According to Sarada, those who have been assimilated by the Claw Crimes are still alive, trapped in the tree formed around them, though they at least don't seem to be conscious.
Chapter 4: The Awakening
- We see what Boruto meant about the Ten-Tails becoming more dangerous than it was previously. As a result of Code's tampering with its body and all the victims absorbed by the Claw Grimes being drained of their chakra, the Ten-Tails has evolved and become sapient and intelligent. It easily escapes its binds and splits into multiple entities based on the victims still trapped in the trees. The newly sapient Divine Trees, led by one that resembles Jigen/Isshiki, easily overwhelm Boruto and force him to retreat.
- Sasuke is shown to have been assimilated by a Claw Grime sometime during the Time Skip.
Chapter 5: Target
- The newly created Divine Trees, having all become individuals after the Ten-Tails became sapient and divided into them, all now choose a new target to assimilate based on their still instinctual drive to consume, their conversations showing a disconcerting uncanny nature as they are all beings for whom sapience was until recently an alien concept. This targeted drive seems to reflect someone who has some kind of deep emotional connection to the person whose form they have taken. Jura, the one resembling Jigen/Isshiki, wants to consume Naruto, the primary cause of Isshiki's defeat and death (which means he may need to get to Kawaki and make him release Naruto somehow). Matsuri, resembling Moegi, wants to devour Konohamaru (her childhood friend). Hidari, the one resembling Sasuke, targets Sarada (his daughter). The currently unnamed Divine Tree resembling Bug chooses to go after Eida (someone Bug was terrified of but powerless against), and he also reveals to her that he knows she's watching them. This ends up frightening Eida, even if she doesn't show it outwardly.
Anime
Episode 28: A Declaration of War!- Shizuma's revelation in staging the war against Konoha by planning on killing the Hokage's son. When Kagura refuses to do so, Shizuma just make blatant lies by accusing the "real" Chojuro as a "ruthless" Mizukage who was "assassinating dissenters and erasing both their family names from memorials". To add insult to injury, Shizuma further claims that Kagura will belongs to him because of his scares thanks to Kagura's attack itself, further breaking Kagura's mind the progress. This means that Kagura's own doubts makes Shizuma's manipulations easy and he would continue to do that to torment the poor guy.
- When Boruto is defeated by Shizuma and his comrades who proclaim themselves as "New Seven Ninja Swordsmen", Kagura, who is helping Boruto up, is shocked to learn that he has been been inducted as the 7th Blood Mist Swordsman and he is given an order to kill Boruto as a respect from the new group. Good news? Kagura spares Boruto. But the bad news is that Kagura will go along with the new group in their quest for chaos. You can see how helpless Boruto is when he fails to stop Kagura from joining the new group while suffering his own injuries.
- Comes to think about it, its terrifying to see that this so-called "war" is started by some teenage thugs who yearn to restore the former Blood Mist Village's "former glory" by declaring a war against Konoha by hurting the son of the 7th Hokage. Meaning that by any chance that the hard fought peace will be destroyed by one dissident who wants to wage war so they can commemorate their clans' name.
- However, it's also rather funny because it couples with Idiot Ball moments since these self-proclaimed "shinobi" are trying to restore the "Blood Mist" by ignite the war between Kirigakure and Konohagakure. Their reason to do so? They view the current peace as an insult to their heritage! Look, guys. we don't care how strong all seven "next-Gen" Seven Swordsmen your are but, do you even know that the Hokage you're fighting against was once a hero who saved the world by defeating the evil Moon Goddess with Sasuke?!
- Tsurushi's terrifying reaction about Shizuma's war enough give you some chills despite he barely survives his former boss' execution thanks to Sarada's healing technique. According to his revelation, the reason why he joined Shizuma's group in the first place was because he thought it makes him look "cool", only for him to realize the war is a serious business, starting by killing his friend for his failure; moreover, he also reveals Kagura's cooperation with Shizuma was because of the past between them where the former injured the latter first, which means that Shizuma used that past to manipulate Kagura's feeling (especially his guilt). Needless to say, this garners Boruto disgust and prompt him-along with Sarada-to find a way to rescue Kagura before Shizuma's gang starting a war.
Episode 29: The New Seven Ninja Swordsmen!
- We get to see the New Seven Ninja Swordsmen trashing the vault, stealing the swords that belonged to the former Seven Ninja Swordsmen and then uses these weapons to cut down the security robots. Kagura is so shocked to see this to the point he begins to question Shizuma's so called "revolution", which Shizuma replied that they were supported by Land of Water's daimyō who disagreed with Chojuro's moderate administration, and their next plan is to dethrone Chojuro and place Kagura as the new Mizukage and rule the Land of Water again. Talk about the violent coup to revive the former infamous village.
- Speaking of the Blood Mist Swordsmen, as the episode goes on it reveals that Buntan, one of these wannabe swordsmen, is a daughter of one former Seven Ninja Swordsmen, making them as the Legacy Character Legacy Characters from the previous group. To see such young people like them to wage war again for something as trivial as their heritage is outright nerving...
- Back to Kagura himself, he remarks about how he is unable to escape from the path his grandfather walked is outright unnerving. How is that horrifying? Well, possibly for years he had struggling not to follow let his blood-lust got the better of him and yet he is shunned by his fellow villagers because of his accursed bloodline, and his meeting with Shizuma along-whom he thought have "understand" him-further opting him to feel despair. Plus, the fact that his remark that he and Boruto will become enemies is both this and tragic due to the fact that he knew well that his life has changed after meeting his new friend.
- This incident above opting Chojuro decide to hunt down the New Seven Ninja Swordsmen and have them to be executed should they harm anyone, including the "defected" Kagura. Granted, this affair has becoming extremely serious considering a gang of rouge ninja were on the loose while attempt to ignite a war just to revive an old memory, and there will be consequences to both Land of Water and its diplomatic relationships with other region. The only reason why this decision is never implemented is thanks to an intervention from Boruto and Sarada, especially the latter when she says that the Hokage she wants to be will never sacrifice anyone for the sake of the village.
- Chojuro being trapped by three of the Seven Swordsman. Luckily for him, its the first three Swordsmen's arrogance to outwit them for their advantage.
Episode 30: The Sharingan vs. The Lightning Blade, Kiba the Fang!
- Kagura's "resolution" itself is this since he is attacking Boruto without any hesitation, for all the wrong reasons.
- The near end duel between Sarada and Buntan almost takes a horrific turn where the latter manages to break through the former's defense and decapitates the Uchiha kunoichi's head! And if that's bad enough, we get to see Sarada's shocked expression on her decapitated head, with lifeless eyes, in a close-up shot. Though the viewers will be relieved that the "decapitated" Sarada is actually nothing more than an illusion and it is revealed that the real Sarada has already activated the Genjutsu during their struggle between the Lightning Blade and the Sharingan, it's still that shocking for what's supposed to be a light-hearted show.
Episode 39: The Path Lit by the Full Moon
- The very idea that Orochimaru had mindwiped Mitsuki at least six times so he could take a very elaborate test to try to mold Mitsuki into being his own person. Judging by how heavily wounded Mitsuki was when he initially woke up the sixth time, one can only assume the worst what had happened in the previous attempts.
- Not to mention how scary it is to wake up with no memory of who you are.
Episode 51: Boruto's Birthday!
- Team Konohamaru is sent to investigate "monster sightings" in a mine. The Nightmare Fuel? They unknowingly stumble upon an Otsutsuki clan relic, and guess what the monster is? A merged White Zetsu!
Episode 52: Sasuke's Shadow!
- Team Konohamaru discovers what happens to the White Zetsu when the chakra reserve in the God Tree runs dry while they are in development: they die and decompose. One of the cocoons breaks off the God Tee's roots and a white sludge oozes out of it.
- When Naruto arrives to help clean up the mess after the merged White Zetsu is destroyed, he and other Konoha jonin pull out thousands of other merged White Zetsu bodies and their deformed faces are twisted with agony. This confirms Naruto and later Sasuke's suspicions that Kaguya Otsutsuki was preparing for a war with her own clan.
Episode 53: Himawari's Birthday
- Koji Kashin's short yet suddenly terrifying appearance in which he puts Katasuke in a genjutsu.
Episode 62: The Otsutsuki Invasion
- Watching Mitsuki get hooked straight through his chest by Urashiki's fishing hook type weapon. Not only that, but Urashiki then ripping Mitsuki's chakra with the hook.
Episode 73: The Other Side of the Moon
- Boruto finding the room full of Mitsuki clones and him finding out from Orochimaru that Mitsuki was a result of experiments.
- The whole idea that this whole time, according to Orochimaru, that Mitsuki had been implanted with a curse mark that would kill Mitsuki by blowing him up if anyone dug too deep in trying to figure out how he was created. It's unclear if Mitsuki knew this himself, at least until he was told about it.
Episode 83: Ohnoki's Justice
- Those weird earth monsters and the artificial humans sent to bring Mitsuki to the Hidden Stone Village? Kurotsuchi's abduction? They were all Ohnoki's plan! Why did he do this? Because he felt that the Stone Village's youth were weak compared to the previous generation. Something like this was discussed in previous episodes regarding the Leaf Village's youth, but they showed promise and made progress in strength, skill and smarts. Just how bad are the Stone Village's youths that Ohnoki would commission an army of rock monsters?
- So the Curse Mark Orochimaru said he implanted in Mitsuki that will make him self destruct? Turns out, he wasn't lying.
Episode 86: Kozuchi's Will
- The revelation that the base for the artificial humans was a White Zetsu sample.
- Ohnoki's callous remark that the artificial humans have no will since they were made by man. He also states it is possible that Mitsuki is no different: a puppet with no will. That said, he soon realizes his error.
Episode 100
- It seems someone wants Jugo's curse mark and replicate its effects. They've already experimented on endangered geese and are now moving onto humans. One of the (willing) curse marked even takes the shape of a velociraptor!
Episode 101
- That harmless bird watcher? Turns out he's in on the whole thing.
Episode 102
- The bird watcher's transformation thanks to the Curse Mark turns out to be pointless as Jugo breaks his hand and drains him of the Curse Mark, leaving him stark naked.
Episode 105: A Wound on the Heart
- The reveal that while Mitsuki was developing extremely well as a human, that growth has caused him significant distress. Orochimaru revealed that this distress could lead to his brain cells dying which would eventually cause him to go brain dead and die if they didn't erase his precious memories.
- Mitsuki having to live with the fact that he would suffer and might die someday due to his decision not to drink the medicine to preserve his life. And the sad fact that he may forget the memories he wanted to keep anyway.
Episode 111
- It seems that history repeats itself as Mirai fights Riyuku, a follower of Jashin just like Hidan. Hell, the guy is an admirer of Hidan! And he seemingly kills Mirai using a spell similar to the one Hidan used to kill Asuma...NOT!!! Mirai used genjutsu, what Riyuku thought was blood was actually hot spring water laced with iron.
Episode 118
- Boruto and Konohamaru are dealing with an enemy that can erase people's memories.
Episode 128
- Urashiki's new plan to capture the chakra of Kurama in Naruto's body: go back to the past when Naruto was a Genin and extract the fox's chakra.
Episode 130
- The worst case scenario has come: Urashiki has found Genin!Naruto!
Episode 131
- Boruto ends up scratched by Genin!Naruto while he's in Kyuubi mode. This single act makes Boruto afraid of his own father in the next episode.
Episode 133
- Urashiki's final transformation involves him ripping out his own eyes and eating them.
Episode 160
- The reveal that someone is using Hashirama Senju's cells for their own purposes. But because of the cells' unpredictability, they end up very slowly killing people. If it weren't for Mitsuki's abnormal genetic code, he would have died when he got infected by a man who had the cells injected in him.
Episode 161
- The Land of Silence has become nothing more than a den of criminals ever since Gengo was defeated by Shikamaru. And the people who live there have no love for the five shinobi villages.
Episode 166: Death Match
- The title of this episode really does it justice. This is arguably the first fight in the series where mortality was truly on the line. The fact that Deepa does not hold back at all in the fight and his sociopathic sadistic behavior just makes the whole fight almost morbid.
- In the fight, New Team 7 is just brutalized. They can only just barely keep up with Deepa's vicious attacks, only just enough to still come out the other side injured, but still alive. Even Mitsuki, one of the most intelligent and powerful of the new generation is unable to keep up with Deepa.
- Deepa's creepy factor is only doubled when he plays along with the team's final attempt at an attack. It all ends with Boruto and Sarada getting knocked out and Asaka self-sacrificing himself for nothing.
- Boruto's terror when he realizes that despite all his, Sarada, and Mitsuki's efforts, that they couldn't even land a scratch on Deepa is notably horrifying. He had become so shocked and horrified by Deepa's power that he didn't even try avoid his attack.
- With his friends in danger, Mitsuki decides to cross his Godzilla Threshold and tap into his Sage Transformation. And it isn't even to fight Deepa, it was to flee. The fact that Sage Transformation has always been marketed as an all-powerful trump card and that it's being used like this really says something about how powerful Deepa really is.
- While the attack Mitsuki while in Sage Form was not so much to try damage Deepa than it was to buy an oppoturnity so he could escape with the unconscious and injured Boruto and Sarada, the fact that Deepa came out of such a powerful attack unscathed is scary in itself.
Episode 174: Revival of the Divine Tree
- The giant tree that sucks chakra or life force out of you and turn you into White Zetsu is back. Nuff said.
Episode 175: Beyond the Limit
- Continuing on from previous episode, despite being an imitation of the divine tree that appeared from the war, it still sucks your chakra dry until you die, which is not shown on screen other than the scream of the victims. It does not distinguish between ally or enemy. You get too close, you'll become its nutrient, which happened to the ringleader, Victor, who was not aware of this and nearly meets his end by the tree he wanted to have its fruit from.
- Had Mitsuki and Orochimaru not arrived to the rescue, Boruto, Sarada, Konohamaru and Mugino would have been wiped out.
Episode 201
- As part of Kara's scheme, Boro has for years been forming a cult that believes that the Infinite Tsukuyomi is a good thing, taking advantage of people's hopelessness and yearning for a better future as well as convincing them that he is a savior who can cure diseases. But we all know Boro is hiding the truth from them. That eventually, any human caught in the genjutsu and assimilated to the God Tree will very slowly transform into White Zetsu, becoming slaves for the Otsutsuki.
