Feeling lonely with her husband who no longer cares about her, Mio spends her days comforting herself with toys. Today, when I was immersed in my daily masturbation work, Kazuya, my neighbor's son, happened to stop by. Mio, who was supposed to be stupid, took Kazuya as a target to satisfy her own desires. "If you promise not to tell anyone... I'll do something good for you."