During summer vacation, Satoshi, a nephew, comes to visit his aunt, whom he has admired since he was a child. While his uncle is away on a long business trip, Satoshi is secretly happy to be alone with his aunt. However, his aunt finds out that he is a virgin and teases him, saying, "Shall I help you get rid of your virginity?" Satoshi's reason is pushed to the brink of collapse as she mischievously presses her big breasts against him.