History Manga / TakopisOriginalSin

* CycleOfRevenge: Marina bullying Shizuka and taking [[BigFriendlyDog Chappy]] away from her, caused Shizuka's [[spoiler: attempted suicide, leading to Shizuka to ruin Marina's life leading to [[MurderSuicide Marina murdering her mother in self-defense and killing herself soon after.]]]]

* BlameTheParamour: Marina's toxic home life includes her abusive father staying out late with prostitutes and fighting with his wife when he's home. Marina blames this on Shizuka's mother, his favorite prostitute, and bullies Shizuka as a proxy for her.
* BullyTurnedBuddy: [[spoiler:With his help, Takopi eventually ends up causing Shizuka and Marina to become friends]].

* GenreRefugee: The title character is a tiny octopus alien that wouldn't be out of place in a {{Kodomomuke}} series, supplying ''Anime/{{Doraemon}}''-style gadgets to kids to help them be happy. The world he landed in, however, is a cynical drama where the children's problems extend far beyond what Takopi can assist with his gadgets.

* DeconReconSwitch: The entire story is a deconstruction of ''Manga/{{Doraemon}}''-style "magical buddy" wish-fulfillment stories, with Takopi's inventions often making Shizuka's situation much worse. Takopi can barely understand humans and has no idea how we really think, so his simplistic, short-term fixes to the problems the three main characters face just end up causing more problems in the future. [[spoiler:Before he lost his memories, he also adopted the idea of killing Shizuka to make Marina happy ''scarily'' quickly, which shows just how dangerous his shallow worldview really is.]] That being said, Takopi ''really does want to help'', [[spoiler:and he eventually fixes the situation by sacrificing his own life.]]

* TheChainOfHarm: There are multiple manga panels showcasing how Marina's actions mirror that of her mother's.

** Azuma turns into a LoveMartyr, willing to do anything Marina says at the cost of his own sanity out of fear he'll lose the only person who's shown him positive affection.

Shizuka lives a hard life. Her father isn't living with her, her mother is rarely home, and she's mercilessly bullied at school her cruel classmate Marina. But it isn't all bad -- she has her [[BigFriendlyDog pet Chappy]], who makes everything okay. Unbeknownst to her, Shizuka is about to get a very special guest in [[RidiculouslyCuteCritter Takopi]], an alien from another world! His first order of business is to spread happiness throughout our planet, and his first person to help is Shizuka. After spending some time together, Takopi promises to make her smile, and Shizuka accepts his friendship.

* DeathIsTheOnlyOption: Takopi exhausts every option he can think of through time travel to make the main characters happy. He uses the last of his power to rewind time and help Shizuka and Marina become friends, which kills him.

* AdultsAreUseless: Every single adult in the entire story is terrible at their job in ''some'' way. Shizuka's mom is never home and her dad abandoned her [[spoiler:to start another family]], Marina's father left her mother when [[spoiler:he was found to be visiting Shizuka's mother for prostitution]] and as a result her mother has become [[SanitySlippage highly volatile]], and Azuma's mother is demanding and emotionally abusive.

* CycleOfRevenge: Marina bullying Shizuka and taking [[BigFriendlyDog Chappy]] away from her, caused Shizuka's [[spoiler: attempted suicide, which leading to Shizuka Azuma to ruin Marina's life leading to

* TheChainOfAbuse:

* DeniedFoodAsPunishment: Azuma's mother often bribes him with fluffy pancakes he can eat if he gets a perfect score on his tests. He's never gotten the chance to because he typically [[TheBGrade gets a point or two off]], causing his mom to take them away at dinnertime and berate him for his failure. The practice has conditioned him into [[DesperatelyCravesAffection desperately craving affection]] from others, and believing that he needs to do everything they ask in order to maintain it. When stress from [[spoiler:being a SecretKeeper for Marina's death]] causes his grades to drop, his mom seems to understand what she's doing and gives him the pancakes as consolation... before revealing she thought it was a stunt for attention, and if he's not going to try to do better anymore, she won't try for him either. The pancakes she gives to him are a sign of giving up on him.

* FlashSideways: [[spoiler:In the final timeline, all three kids still have some memory of Takopi despite him never meeting them. Marina makes fun of Shizuka for not wearing her usual head flower, and both girls tear up at a doodle of Takopi in Shizuka's notebook, imagining it would be an annoying but good friend if it was real. They even think a pen with a cat topper resembles the Saturn Cat Ball Pen, despite both considering it a case of StrangeMindsThinkAlike at the time. Azuma also starts a genuine relationship with his brother by fighting over something petty like he told Takopi to tell his past self.]]

* LaserGuidedAmnesia: Chapter 12 reveals this happened to [[spoiler:Takopi. He came to Earth in 2022, and after coming to understand Marina and her problems, believes the only way he can help her be happy is by killing Shizuka. When he went back home to use the Big Happy Clock, his mother took his memories for breaking their planet's law.]]

* TwentyMinutesIntoThePast: The story takes place in 2016, five years before the manga was published.

* TitleDrop: Chapter 13 is titled "Takopi's Original Sin", the name of this manga.

* DeniedFoodAsPunishment: Azuma's mother often bribes him with fluffy pancakes he can eat if he gets a perfect score on his tests. He's never gotten the chance to because he typically [[TheBGrade gets a point or two off]], causing his mom to take them away at dinnertime and berate him for his failure. The practice has conditioned him into [[DesperatelyCravesAffection desperately craving affection]] from others, and believing that he needs to do everything they ask in order to maintain it. When stress from [[spoiler:being a SecretKeeper for Marina's death]] causes his grades to drop, his mom seems to understand what she's doing and gives him the pancakes as consolation... before revealing she thought it was a stunt for attention, and if he's not going to try to do better anymore, she won't try for him either. The pancake she gives to him is a sign of giving up on him.

* DeniedFoodAsPunishment: Azuma's mother often bribes him with fluffy pancakes he can eat if he gets a perfect score on his tests. He's never gotten the chance to because he typically [[TheBGrade gets a point or two off]], causing his mom to take them away at dinnertime and berate him for his failure. The practice has conditioned him into [[DesperatelyCravesAffection desperately craving affection]] from others, and believing that he needs to do everything they ask in order to maintain it. When stress from [[spoiler:being a SecretKeeper for Marina's death]] causes his grades to drop, his mom seems to understand what she's doing and gives him the pancakes as consolation... before revealing she thought it was a stunt for attention, and if he's not going to try to do better anymore, she won't try for him either. He's then "rewarded" with the inverse: he can eat ill-prepared pancakes any time he wants.

Shizuka lives a hard life. Her father isn't living with her, her mother is rarely home, and she's mercilessly bullied at school her cruel classmate Marina. But it isn't all bad- she has her [[BigFriendlyDog pet Chappy]], who makes everything okay. Unbeknownst to her, Shizuka is about to get a very special guest in [[RidiculouslyCuteCritter Takopi]], an alien from another world! His first order of business is to spread happiness throughout our planet, and his first person to help is Shizuka. After spending some time together, Takopi promises to make her smile, and Shizuka accepts his friendship.