The Misplaced Hero: What Do You Mean, the Demon Lord Has Already Been Defeated?

Jackson Thomas Grenell is a veteran of an ugly war, trying to forget the things he experienced there. He plays video games, practices HEMA, and escapes into the other worlds of isekai anime. Only the dubs, of course. He watches anime and reads books.

Imagine his surprise, then, when he's run down in his own living room while playing his favorite computer RPG and awakens in another world. One of fantasy monsters, magic, and mighty heroes.

Imagine, too, the surprise of those he encounters there. See, the previous hero has already defeated the demon lord and become king. So why then, is Jack here?