One day, the tax office receives a phone call. It was an accusation that the inn run by Nanao was involved in significant tax evasion. Tax officials Ooiwa and Ii immediately set out to infiltrate the hot spring inn where Nanao was staying for an undercover investigation. Noticing the tax officers staying overnight for the investigation, Nanao, wearing a see-through yukata, attempts to seduce them with extremely risky erotic tactics to somehow evade the tax audit.
