Receiving news that her cousin, who has just taken the university entrance exam, is coming up to visit, Momojiri Kanon is very excited because she finally gets to meet her cousin whom she used to play with as a child after quite a long time of no contact. She is very thoughtful and enthusiastic while he is here, doing everything to make him feel as satisfied as possible, including bathing together - one of their unforgettable childhood memories. But time has passed, and now he has become a teenager, at an age with intense psychological development, so just a sensitive trigger like their recent bathing together could make him lose his rationality. Added to that, the fact that his cousin always walks around naked and performs highly alluring seductive moves makes it certain that unwanted things will happen.
