Maika, who lived with her mother, was in a single parent environment and started down a bad path. At that time, it was decided to remarry, and a new father settled in the house. An existence that I don't like … During his mother's absence, the creature bared his fangs and revealed his true nature. I tried to fight off the demon that targeted the undeveloped anus, but I couldn't forget the face of my mother happily remarrying, and Maika's anus eroding, expanding, and growing.