Receiving news that her cousin just came up from the countryside to visit after taking the university entrance exam, Shirakawa was very joyful because she could finally see her cousin whom she had played with since childhood after a long period without contact. She was very attentive and enthusiastic while he was here, doing everything she could to make him feel satisfied, even bathing together - one of their unforgettable childhood memories. But time has passed, and he has now become a teenager, at an age of strong psychological development, so just one sensitive trigger like their recent shared bath could lead him to lose his reason. Additionally, with her cousin constantly being naked and performing very seductive inviting actions, unwanted events were sure to happen.