Rika, an office lady, finds herself drawn to her senior coworker, Komuro, though she tries to suppress her growing feelings. Unbeknownst to her, Komuro notices her affection—and discovers her secret longing. Rather than reciprocate, he begins to exploit her emotions, subjecting her to relentless psychological and physical torment. Beneath his professional exterior lies a sadistic nature, skilled in the art of domination and pain. As Rika is ensnared in his cruel games, she is drawn into a dark world of bondage and suffering. Led into the depths of Hebibaku's female prison torture, where women's anguish and sadism intertwine, a new stage of torment begins—one step at a time.