one day, a phone call comes to the tax office. it was a report that the inn where Nanao works as the landlady is evading a considerable amount of taxes. immediately, tax officials Ooiwa and Inagaki headed to the hot spring inn where Nanao is, for undercover investigation. Nanao, who noticed the officials conducting an undercover investigation while staying at the hot spring, devised a plan to somehow avoid the tax investigation by setting up a super dangerous erotic trap for the officials in a see-through yukata.