The main character returned to his parents' home after university, 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 advide to dazzle the protagonist.
However, his mother, Chikage, notices it. Kyoko then goes all in to shrink her relationship with her own son.
In addition, his tsundere's younger sister Aki and Kyoko's daughter Yuma participate in the battle, and the kinky family's skinship around the hero begins!