The youngest of three siblings, "Machi". Under one roof, the brothers and sisters who live together have a secret that they can never tell others. De S's eldest brother devours his sister's body every day, and de M's second brother gets an erection in such a "town" appearance. One day, he is squid with his eldest brother's big, and another day, he seduces his second brother and mischievous Ji Po. This is a daily record of three brothers and sisters who have blended into their daily lives as a matter of course.