Seiji (Yasuyuki Sakurai), who dropped out of high school, was aiming for high school graduation and university entrance exams, thanks in part to his private tutor Chieko (Sumire Nagai). Chieko is an active female college student, and Seiji's age and home environment are close, so her mother, Fumie (Handa Sasa), pours her excessive interference into her son. It made me hate. One day, Fumie discovers that her classmate Midori (Miu Kiritani), who likes Seiji, is about to have her first experience with Seiji, and she is furious. She even ripped the two apart with her insane protests to Midori's parents. A few days later, Seiji, who has cut off his relationship, promises to meet Midori in the park at night, but Fumie quietly follows Seiji, who has left home....