Using the excuse that the air conditioner is broken, stepmother Chiaki calls her stepson Koji. She has been using him as a convenient adulterer by paying off his debts, but today Koji makes a surprising request: would she sleep with the senior who owes her money? Chiaki is taken aback by the outrageous proposal, but when Koji says he'll join in, she reluctantly agrees... In addition to the first chapter, which mixes calculation and desire, the second chapter also features a wicked son and a devoted stepmother! This is a must-see!