Mariko has a conflict with her school over a bullying issue and is assigned to a new post far away. At her newly appointed school, she becomes an advisor to the art club where only member Kuroi is enrolled. One day, when she goes to her clubroom, she sees Kuroi being bullied. Even though her girlfriend Mariko reprimands her, her situation doesn't change, and Kuroi tells her, who is overwhelmed by her helplessness, "I'm happy just to protect you." Mariko, who is a mixture of her pity and love, crosses the line with Kuroi in her clubroom after school.