Living with a cruel sister who subjects her to various sadistic acts under the control of a male trainer, Reika endures collar restraints, nipple clamps, deep throat servicing, animal-style bondage, and lewd tied-up sex. She is constantly forced to report everything, exposing her innocent, soft body to lesbian masturbation and humiliating erotic teasing day after day. Her beautiful yet pure body continually becomes the target of new restraints and perverse games.