Son, Yoshio, whose mother, Masumi, got a job at a company that sells bento by door-to-door sales. Yoshio, who has suspicion about the employees who buy expensive lunches every day, witnesses her mother serving the employees physically. When I follow my mother, I enter an apartment with an employee and am drowning in an affair. She blames her mother for flirting with the president at the company, but it develops into a violent 3P due to Masumi's sticky sex appeal.