My innocent little sister, a young schoolgirl, keeps aggressively coming on to me, completely ignoring that we're siblings. I'm completely helpless. She sincerely confesses, "Hitomi loves Onii-chan more than anyone else in the world☆ That's why I want to do anything to make Onii-chan happy☆" Caught between confusion and temptation, I'm overwhelmed by her pure, intense feelings.