Ren Mizuki is a big-breasted woman who can't forget the single training session she once endured. On a restless night, she resolves to visit the bondage master's room of her own accord. The man who has long been watching her every move begins to torment her, greedily devouring the young body he's been longing for. As pleasure writhes through her, Ren clenches her hands behind her back, unaware that she's already fallen into his merciless trap. What fate awaits her trembling, humiliated body?