Azusa, his mother's younger sister, has divorced and started living alone. Ryota, her nephew, goes to help her tidy up her room, but... The house she got as divorce compensation is a mansion, and it's hard to tidy up the room. Ryota is exhausted every day, but he works hard because he wants to see the beautiful happy face of Azusa. Just as he's about to go to bed early for the next day, he hears Azusa's sexy voice, which he's never heard before. Suspicious, Ryota peeks into the next room and...