“Tomifumi, isn’t it about time you gave us a grandchild?” My father-in-law’s request unsettles me during what should have been a cheerful family hot-spring trip. Following my mother-in-law’s instructions, I abstain for a full month so I can try for a baby with my wife at the inn, only for my wife to refuse on the day. Restless and painfully frustrated, I wander the ryokan and accidentally see my mother-in-law bathing. I lose all restraint, spend the overnight trip creampieing her again and again, and ultimately leave her pregnant with a secret I can never confess to my wife.