Akishiro Fukashiro is a magical girl of justice, Silky White. She has been fighting to protect people from the devil's hands of the invader Noir, She is defeated by the enemy female executive Nero, and she becomes captive. After Nero's lewd pleasure training aimed at the power of her magical girl, Fukashiro awakens to a dark magical girl. Fukashiro, who became a female who stripped her fangs to the people she should protect and devoured only pleasure ...