Kenji, whose parents are away on a trip, begins living with Yuna, his aunt whom he has admired since childhood. To him, Yuna is like a beautiful woman from a fairy tale, and every day with her is filled with joy. However, one night, as Kenji passes by his uncle and Yuna's bedroom, he witnesses them passionately making out with deep tongue kisses. From that day on, Kenji starts having lewd dreams about Yuna every night, and eventually, unable to contain himself any longer, he assaults her.