"My beautiful and intelligent stepmother, who wants to have contact with society, continues to wear a suit and go to work even after marriage." Hibiki remarried a man who runs a company. Worried about her son, who remains reclusive at home even though he is an adult, she takes good care of him as a mother, even though she is his stepmother. But one day, when Hibiki comes home from work, her son demands sex and pushes her down. "No, Masaki, please calm down," she says, her body throbbing with sweat.