Yuka, whose lived in Takayama for her whole life, moved to Tokyo to start her university life. To save money, Yuka lives with her uncle, Hiroshi, and her aunt, Akiko. Uncle Hiroshi is her mother's younger brother. Uncle Hiroshi and Aunt Akiko often visited Yuka and her family every winter break, and hence the relationships betwen them are good. They do not have children, so they really welcome Yuka in their house.
Yuka has liked Uncle Hiroshi since she was young. Yuka likes how Uncle Hiroshi reads bed stories to her, how Uncle Hiroshi bathes her, dries her hair and dresses her up. However Uncle Hiroshi had stopped taking a bath with her since she was 12. Yuka wishes she could do those things longer, but she knows it is not possible as she started to develop her womanly figures.
Yuka thought she had forgotten her feelings. However, since she has lived with Uncle Hiroshi, her desire for Uncle Hiroshi grows. Join Yuka and Hiroshi in their forbidden relationship.