In a single-parent household, Tsuzumi, the daughter, always feels lonely because her father is always busy with work. One day, she starts talking to a middle-aged man who lives nearby, and they gradually become good friends. However, before long, the man begins to play with Tsuzumi's nipples, and eventually, he starts performing sexual acts, calling it 'play'. Nowadays, having sex is normal, and the acts keep escalating. The man's friends also start coming over to the house, and they all end up piling on top of each other...
