Female teacher Shihori is assigned to supervise her students on a school trip, but at the destination, she suffers at the hands of Okumura, the chairman's son. Knowing that her own affair with the chairman is the root cause of Okumura's delinquent behavior, she finds herself unable to stand up to him. That night, she is suddenly attacked by Okumura in the bathroom, and her ass—previously trained and defiled by the chairman—is mercilessly raped. But it doesn't end there. She is dragged to the students' room, where she is forced to endure an even deeper tragedy.