A plain, serious, and shy single bank employee, Akane Sawamura, is having an affair with her married superior, Section Chief Iida. Just then, Dai Kuro, the owner of a sex industry business who had been refused a loan by Iida, finds out about Iida and Akane's affair and starts to threaten Akane. Fearful that her relationship with Iida will be exposed, Akane decides to work at Dai Kuro's shop without telling Iida...
