The main character returned to his parents' home after graduating high school, but there is awkwardness with his family because of his long dormitory life. He shared it with his mother's senior and neighbor, Kyoko Kawashima, but she actually wanted the protagonist to be her own son. She set up naughty skinship in form of advise so that the protagonist would become obsessed with her. However, his mother, Chikage, notices it and desperately tries to get closer to her son, So that he would not be stolen from her. However, she got too excited about her own son--!? In addition, his tsundere younger sister Aki and Kyoko's daughter Yuma participate in the battle, and the kinky family's skinship around the hero begins!