His stepdaughters from his second marriage are a beautiful older sister, Yuika, and a cute younger sister, Hikaru. "I want to squeeze their breasts and asses somehow...!" The stepfather's head was filled with lewd desires. One day, he learns of the existence of the "Brainwashing Maker." It is an app that can rewrite the mind of the target person and brainwash them. Though skeptical, he uses it, and the sisters fight over their stepfather's dick! Fuck each other! Creampie multiple times! The sisters' minds and pussies are treated like toys after being successfully brainwashed...