In a futuristic Tokyo, a secret research project develops forbidden androids designed solely to fulfill their master's desires. Created by sexual scientists, these mechanical girls possess advanced erotic capabilities beyond human women, existing as the ultimate beings dedicated to male pleasure. Equipped with skills like aggressive seduction, cosplaying, footjobs, and more, these androids—such as Azusa Mizuki and Miyabi—have replaced their very purpose of existence with one goal: satisfying their master. Their devoted, single-minded service evokes a strangely melancholic beauty.