“Shinichi, could you abstain for the month before our trip?” His father-in-law's sudden request leaves him confused. What was meant to be a private family hot-spring vacation becomes an opportunity to try for a baby with his wife. Yet his wife has no interest in having children and rejects every advance he makes. After a month of abstinence, he wanders the inn late at night trying to calm his pent-up desire and unexpectedly catches sight of his mother-in-law bathing.