Wife Mineko, whose husband is unable to travel due to a back injury, heads to his parents' home accompanied only by her stepson. Since the boy is her husband's child from a previous relationship, Mineko has no blood ties to him and has always seen him merely as a young boy. However, the stepson views Mineko not just as a mother figure, but as a desirable woman, and upon learning that his father wouldn't be joining them, his heart began to race uncontrollably. Seizing the opportunity, he convinces Mineko to change their plans and stay overnight at a nearby inn instead of the family home. Seeing this as the perfect chance, he begins plying her with alcohol, attempting to seduce her. But will his intentions truly reach Mineko? And will the emotions growing between them go beyond mere romance?