A boy who awakens his memories of his past life wakes up to find himself facing a "zombie crisis." Is this some kind of American variety show world, or the world of Hunter x Hunter?

So the first thing to do now is to escape this city.

Richard, the time traveler, faced both good news and bad news. Good news: He'd traveled through time and become a wealthy young man. Bad news: He'd arrived in the unfamiliar land of Oluba. Good news: Pokhrani, where he lived, was a wealthy nation rich in "star steel" deposits. Bad news: It was September 1, 939, and Pokhrani, facing the "blitzkrieg" launched by the Talmenrecher Empire, was about to collapse. Watching the Stukas swooping down from the sky, the time traveler was overcome with grief. "This place is terrifying! Let me go home!" Six years had passed in a flash, and Richard had earned many titles. He was universally recognized by all Pokhranians as the greatest national hero of the 20th century; he was the nemesis of the Desert Fox; he was the "White Death" who had killed the most enemy officers...