Oops, I Married the Demon Lord for Tax Benefits

When exhausted accountant Miles Finch dies during tax season, he wakes up in the magical kingdom of Aurelia with one legendary skill: Absolute Optimization. He can see the hidden numbers behind everything—combat stats, crop yields, dungeon profits, romantic compatibility, and even the exact morale penalty caused by bad soup. Unfortunately, the goddess who summoned him expected a sword-swinging hero, not a spreadsheet gremlin in loafers.

After accidentally defeating a dragon by reorganizing its hoard and crashing the local economy by inventing coupons, Miles is banished to the supposedly doomed Demon Frontier. There, he meets Seraphina, the terrifyingly beautiful Demon Lord whose empire is bankrupt, understaffed, and three audits away from collapse. To prevent war, exploit a marriage loophole, and save both their kingdoms from financial ruin, Miles becomes her contractual husband.

Now armed with divine accounting, chaotic allies, and one extremely flustered demon queen, Miles must build a monster nation into the world’s first profitable utopia—before the heroes, gods, and tax collectors come for him.