Start, story, problem and problem solved.

Chiyo, a shy man, died from a heart attack while trying to order food.

He awakened in another world with powers fit for a hero—but he hated attention, so he applied for a job as an accountant.

His math skills amazed the medieval society. His work improved the city so much that the emperor summoned him.

After a few conversations, his ideas on logistics formed an army capable of defeating the demon lord—without fighting.

Grateful, the emperor married him to his daughter.

Chiyo became the new emperor and lived a peaceful life, surrounded by love... and paperwork.