Men with twisted desires kidnap petite, pure, and innocent Yui. Subjected to repeated humiliation including forced shaving, incontinence, and vibrator torture, she is eventually dominated by a brutal cock penetrating her tiny pussy. Gradually, Yui's mind erodes as she begins to enjoy and accept the BDSM games. Swallowed by the men's lust, she transforms into a female beast. This is an extreme erotic story where physical and psychological torture intertwine.