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. However, time has passed, and now he has become a teenager, at an age where psychological and physical development is intense, so just a sensitive trigger like their recent bath together could make him lose his reason. Additionally, with her cousin often being naked and performing very enticing inviting gestures, unwelcome things will surely happen.
