Hana Haruna, a big-breasted wife married for 3 years, lives with her husband who works as an exterior worker. Because her husband's income, which was originally unstable, has been on a long break due to an injury at work, the household finances were in a precarious state every month. One day, Hana, who couldn't manage to get the rent for the 25th of the month, reluctantly went to the landlord's room to ask for a payment extension. However, the landlord, who had been very interested in Hana's big breasts from the beginning, offered an obscene exchange condition…