Akihito Kurusu and his childhood friend, the popular school idol Aoi Kanzaki, share a deep bond, but their lives are upended by the predatory Shoda-sensei. Using manipulation and his position of authority, the teacher coerces Aoi into a series of sexual encounters within the school. Despite Akihito's suspicions and attempts to reach her, Aoi is trapped in a traumatic ordeal that destroys her innocence and leaves Akihito devastated.