One day, Hiroshi comes to his friend's house, but unfortunately, she is not there. His mother, Rena, invites him to dinner since she is there anyway... Rena, who is secretly feeling lonely because her husband is away on a business trip, gets drunk and steals Hiroshi's first kiss. Hiroshi is staying the night, but is unable to sleep after this first experience and leaves the room, where he accidentally witnesses Rena masturbating out of loneliness. Drunk and mistaking him for her husband, Rena forcefully pulls him into her arms, kisses him again, and then, driven by her desire, pushes Hiroshi down...