Eiden Sakitaka is an eccentric medieval weapon collector and auditor who strives to always produce ‘Excellency’ in the outcome of his work, not after his parents' death from carelessness.

One day, an intern didn't follow his instructions and ended up injured, with Eiden having to pay for their treatment. At the same time that his little sister's tuition is due, he wouldn't be able to pay for both if he didn’t sell his collection.

Instead, he stole a dagger, hoping it would sell big time. His plan worked, but instead of money, he woke up in another world, residing inside the body of Nilam Voltimier, a noble whose hand was gripping the very same dagger, half-buried in fresh corpse.