Tomoya’s father remarries to another woman, giving him a stepsister, Ichika. However Ichika is 17-years old and has completely fallen in love with her stepbrother who is only 13!!
Onee-chan ga Kita ("My Big Sister Arrived") is a manga by Rikou Anzai, which was serialized in Manga Life from 2010 to 2020. It was later adapted to an anime, which premiered in January 2014. Crunchyroll is streaming the show, which can be viewed here
by audiences worldwide except Japan.
Tropes in the show include:
- Adorably Precocious Child: Tomoya is a little younger than his sister Ichika, and definitely a lot shorter. And he certainly seems more mature than her.
- All Love Is Unrequited: Ichika seems to be in love with Tomoya, but he only considers her a sister, and in turn Tomoya is in love with Fujisaki, who only has eyes for Kouki, while Kouki only has eyes for Ruri.
- Beach Episode: Well, it's a pool, but the girls are in swimsuits in episode 5 because of this.
- Bitch in Sheep's Clothing: Fujisaki, she pretends to be nice to be popular but is actually a narcissist, and although she eventually becomes nicer to Tomoya, that doesn't stop her from pretending to have feelings for him to piss off Ichika, or use him to get closer to Kouka.
- Break the Cutie: Fujisaki's past reveals she was bullied, and even when she tried to be nice as told to by a teacher, boys still treated her with contempt.
- Breast Attack: Ichika slaps Marina's breasts after Tomoya stares at them in episode 3. She is understandably confused at the sudden smackdown.
- Brother–Sister Incest: While they aren't blood-related, Ichika seems intent on doing this with Tomoya.
- Bullying a Dragon: Fujisaki constantly feigns attraction to Tomoya to make Ichika angry, even when she is aware of how possessive Ichika is and how violently she can react when jealous.
- But Not Too Foreign: Marina is a quarter Russian, while her cousin is half.
- Buxom Beauty Standard: Marina is well-endowed causing her to attract a lot of unwanted attention from the boys. Ichika mostly looks at them with envy, and tries to downplay them in episode 9 by saying that "just being big is meaningless." The former immediately asks where she was looking when she said that.
- Casanova Wannabe: Mitsuru, Tomoya's next door neighbor, tries to flirt with Ichika's friends, Ruri and Marina. Both of them are disgusted by his actions.
- Chick Magnet:
- Kouki, who gets a lot of valentine's day chocolate from the girls in their school.
- Subverted with Souichirou Fuji, he is so handsome that many women are attracted just by looking at him, but that attraction quickly disappears when he starts talking about his otaku tastes.
- Clingy Jealous Girl: Ichika, who slaps her friend Marina's boobs after Tomoya sees how big are. She also doesn't like Fujisaki due to her being in the same class as Tomoya, and especially because he seems to show some interest in her.
- Comedic Spanking: Ichika spanks Tomoya at the end of the first chapter for not walking home from school with her.
- Debut Queue: Each of the early episodes shows a new character, showing Ichika and/or Tomoya interacting with them.
- Distracted by the Sexy: Both Mitsuru and Tomoya when they first meet Marina, and notice her large breasts almost immediately.
- Everyone Has Standards: Although Ruri and Ichika's mother usually support Ichika in her feelings for Tomoya, even they are willing to stop her if they think she is going too far, such as trying to forcibly kiss him, or trying to bathe with him.
- The Friend Nobody Likes: Mitsuru, being so perverted, earns everyone's displeasure, and is only tolerated for being Tomoya's best friend, and even Tomoya himself questions why he is still friends with him.
- Gratuitous English: Marina's brother in episode 5 asks if Tomoya or Ichika can speak English. She replies that she can, then they switch over to Japanese for the rest of the episode.
- Hopeless Suitor: Tomoya seems to feel this way in episode 11 after seeing Kouki's gift towards Fujisaki.
- Idiosyncratic Episode Naming: All of the episodes follow a similar format as the title.
- Imaginary Love Triangle: Although Fujisaki and Ichika have a real rivalry, Ichika assumes that it is because she wants to "steal" Tomoya from her, although in reality Fujisaki is not interested in him, even so she is often willing to pretend in order to make Ichika angry.
- Loophole Abuse: In the first episode, Tomoya hangs a sign in front of his door saying he'll stop talking to her if Ichika enters that way. So she tries to enter from the window instead.
- Mistaken for Romance: Because Fujisaki and Ichika compete (albeit for completely different reasons), many people assume that Fusijaki wants Tomoya for herself, when in reality she is not interested in him.
- Not Blood Siblings: Tomoya and Ichika are step-siblings, due to his father marrying her mother.
- "Not So Different" Remark: Kouki gets off on the wrong foot with Tomoya in episode 4. However, their sisters arrive, and while Ichika tries to comfort Tomoya, Ruri, Kouki's sister, beats the living daylights out of him. Although both are treated vastly differently, Tomoya kind of understands that Kouki also has difficulty with an older sister as well.
- Oblivious to Love: Ichika does not recognize any man who is not her stepbrother, which makes her not understand why some men gave her cookies on Valentine's Day, to the point that Tomoya can't help but feel sorry for them.
- Otaku: Marina's cousin is one, which is revealed when he excitedly talks about how Ichika resembles a girl from a game he's played.
- Shipper on Deck: Ruri and Ichika's mother usually support Ichika in her feelings for Tomoya.
- Single-Target Sexuality: Ichika towards Tomoya. This is eventually subverted, when she develops a crush on a singer, but it turns out to be double subverted when she only had a crush on the singer because he reminded her of Tomoya.
- Spit Take: Tomoya does one in the first episode after walking into his room while Ichika was changing.
- Super Drowning Skills: Ichika doesn't seem to know how to swim, as seen in episode 5.
- Suspiciously Specific Denial: Tomoya says he doesn't like Fujisaki, or thinks she's cute at all, in episode 2.
- Too Kinky to Torture: Kouki calls Ruri's abuse the "Whip of Love''
- Unknown Rival: Played With. Fujisaki and Ichika is a rare case where rivals do this to each other due to their different motivations, Fujisaki sees Ichika as a rival to her popularity, even when Ichika doesn't care about being popular, meanwhile Ichika sees Fujisaki as someone who wants to "steal" Tomoya, even when Fujisaki is not interested in him.
