Wisdom's husband is a salaryman who frequently travels abroad and has been away from Japan for some time. On the other hand, her brother-in-law Naoya does not have a steady job and lives with Wisdom but enjoys visiting sex establishments, accumulating debt, and ends up plotting to make Wisdom work in anal soapland. Wisdom falls into the trap and, guided by the smooth-talking owner Mizushima of the sex establishment, has her anus developed and is made to service customers as an anal soapland girl.
