Kanade, a college student, visited her girlfriend, Aimi's house, for the first time. - Her younger sister, Kaede, who was introduced there, is cute and free-spirited, and her braless boobs are glimpsed from the gap in her clothes. - Her body is unaware of her bustier than her, and her crotch is fully erected. - Perhaps she noticed him who was excited, but her little devilish sister began to seduce her G cup boobs closely. "You're bigger than your sister, aren't you? Are you going to like it?" Kanade, who has exceeded the limit of patience, loses to desire and squirms every day. A scumbag boyfriend who lusts for immorality.