Mitsuha works as a photographer's assistant. She calls the photographer "sensei". One day, they decide to stay overnight at an abandoned school in the countryside. Mitsuha has never thought of Sensei as a man, and she has a boyfriend. However, Mitsuha Kokoro at night in the abandoned school and is afraid to sleep alone, so she asks Sensei to sleep with her. There's no way something won't happen when two grown men and women sleep in a small tent. Mitsuha falls for the "suspension bridge effect" and boldly allows Sensei to cum inside her...