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.
Aoi finds herself trapped in a cycle of abuse and pleasure under the control of the sadistic Shoda-sensei. Despite Akihito's desperate attempts to protect her, Shoda's psychological and physical manipulation erodes Aoi's will. In a cruel turn of events, Aoi eventually succumbs to the teacher's dominance, betraying her feelings for Akihito in favor of the dark pleasure Shoda provides.