Anata no Imouto: A Crazy Little Sister’s Blackmail Training

Imagine having a cute childhood friend you used to play with all the time at the park near your house. As you grow up, you attend the same school, eventually fall in love, and finally start dating.

You go out together after school, stop by the arcade, play some games—and the best part is that you were good friends before dating, so everything feels just right. That’s the plot of Anata no Imouto.

It’s been 2 months since Yuuka and Kouta, childhood friends, started dating. She’s an extremely cute, cheerful girl who’s thrilled to have her childhood friend as her boyfriend.

One day, Kouta invites Yuuka out after class. They head to the arcade and play a bit, then he invites her to his house since “no one will be home.” Embarrassed, Yuuka accepts.

They’ve been dating for 2 months now—maybe it’s time to take things a little further? In his room, the two get excited and soon try to do it for the first time.

However, Yuuka gets nervous. Even though she wants to, she’s too anxious and can’t go through with it. Kouta doesn’t force her, and they end up cuddling—until the doorbell rings. He gets dressed and goes to check who it is, while Yuuka lies on the bed thinking about their relationship.

She—and I, the one writing this—never expected this page:

I got such a huge shock reading this manga when I reached this page—you can’t even imagine. Now comes the twist of the series. The girl under the bed, who had been in the room the entire time, is Kouta’s little sister, and the three of them used to play together as kids.

The little sister loves her brother so much, and as a classic yandere, what will she do? Exactly—she’s going to “train” Yuuka in all kinds of adult ways so she can properly satisfy her brother.

This includes training on how to use her mouth down there, because the little sister recorded everything and threatens to leak the photos if Yuuka doesn’t obey.

There you have it: a crazy story from Anata no Imouto, where we have a little sister blackmailing her new sister-in-law, training her in adult ways to please her brother… but I wonder which direction this story will take next.