A world ruled by a certain “strange law”. In a time when hero and demon lord cooperate, a beautiful angel appeared. That angel told the hero this. [You have obtained half of the world. A tax will be imposed related to this donation.] In short, that “strange law” is paying taxes to the god. The hero, who is frightened by a enormous donation tax caused by immense fortune that is “half of the world”, chooses a way to escape from the taxes. And that is to fake a marriage with a demon lord and to rely only on one girl. That girl’s occupation is the only one that can oppose tax angel, and with this tax accountant survivor– New tax isekai comedy is raising it’s curtain.