The Fujiiwase couple, celebrating their tenth wedding anniversary, had come on a hot spring trip at the husband's arrangement. In contrast to Rena, who was delighted by the rare trip, her husband seemed restless. That night, as they were enjoying the banquet meal, Rena lost consciousness immediately after taking a sip of alcohol… When she came to, she found herself confined in a dark and cold dungeon and learned from the manager, Oshima, that she had been sold off as collateral for debt. Ordered by Oshima to work as an anal slave, Rena reluctantly accepted the humiliation for her husband's sake…
