Entering their third year of marriage, Hana Haruna, a busty housewife, lives with her husband who works as an exterior construction worker. Her husband's income is unstable, and after suffering an on-the-job injury, he's been forced into long-term leave, leaving their household finances struggling to cover monthly expenses. One day, facing difficulty paying the rent by the month's end on the 25th, Hana visits her landlord's room to request a payment extension. However, the landlord takes a strong interest in Hana's huge breasts and proposes a disturbing condition in exchange.