In an abnormal situation, a son introduces his fiancée, Riho, to his father. The father proposes that in exchange for covering the wedding and honeymoon expenses, the son allows him to sleep with Riho. The son agrees to the terms. Shortly after, Riho drinks tea offered by the father and suddenly becomes overwhelmingly drowsy, losing consciousness. Taking advantage of her helpless state, the father begins molesting her body, and soon the son joins in, leading to a twisted scenario where both men indulge in her unconscious form.