"Wanna touch me? No one's watching, so what's the harm?"
Mizuki, a soothing and motherly big-breasted older sister type, has taken a deep interest in Shiraishi, the clumsy manager of her idol group. He’s earnest but hopelessly incompetent, and his unreliable, pitiful demeanor stirs both her maternal instincts and her desires. One day, after dozing off on the sofa from exhaustion, he wakes up to find himself resting on her lap—while her massive breasts hover right above him. At this point, there’s no choice but to let himself feel really good…