Isekai Office Worker: The Other World's Books Depend on the Bean Counter

Just before turning 30, office worker Seiichirou Kondou is suddenly swept into a Holy Maiden Summoning ritual and transported to the Romany Kingdom in another world.
Having spent years working day and night with the soul of a true corporate drone, Seiichirou immediately asks for work even in this unfamiliar land. He is assigned to the royal accounting department, where he throws himself into reorganizing its chaotic bureaucracy.
During his hectic days, he comes across some nutrition tonic that miraculously wipe away his constant fatigue and long‑standing health issues. Overjoyed at first, he soon learns the truth: with no tolerance for this world’s magicules, the tonics actually put his life in danger.

To survive, he must have someone with magical energy help his body adjust to the magical energy. Thus, Seiichirou ends up entrusting himself to Aresh, the commander of the third royal order, known throughout the realm as the Ice Nobleman...