A classmate falls for Momo, a top student at Tokyo University who works as a private tutor. She's not just an ordinary tutor—surprisingly, she also teaches him about sex. The boy, hiding his feelings for her, silently walks beside her, longing and lonely. One day, after having sex, Momo tells him, "I'm going back to my hometown—it's our last time," shattering his heart. Shocked and heartbroken, Momo makes the decision to sell her body. Her actions symbolize love, desire, and the arrival of an ending.