During the first year, peace remained…

During the second year as well, peace remained…
And during the thirteenth year as well, peace still remained…

Gi Musen (CV: Suzuki Tatsuhisa) wakes up one day, several years after his death. He realises he was called for a reason; the person sacrificing themselves for something, but they missed the part in the summoning giving him a reason and now he’s only been offered the body. It’s not too difficult to figure out though, and soon he’s working on the vengeance of his host, while hoping to stay alive himself now that he’s back from the dead.