Lance Corporal Daniel J. Smith has a plan: finish his tour of duty with the North American Alliance Marines, return home to Sentinel City, and marry his girlfriend.

Sounds simple, but as he's picking out an engagement ring, Daniel is struck by overwhelming pain as his soul gets ripped from his body and dragged across reality to a new world, a world of swords and magic.

Daniel barely has time to get used to his new body before he's whisked away to speak to a king.

A king who informs him that he's been summoned to fight the Demon King.

With no way back home, Daniel must learn to use his new powers before the Demon King launches an all out assault on the Five Kingdoms.

Will Daniel become the hero the world needs or will the Demon King destroy everything?