Souma Sagara is a loner university student who gets teleported into his favorite-albeit buggy!-RPG. There, he encounters one of the most powerful NPCs in the game...but not, contrary to their many previous run-ins, as an ally. This time, they face off in a battle to the death! However, this is no simple matter of a game over meaning lost progress. Dying in-game meansSouma will be gone for good!

Together with Miss Train, Souma's new NPC party member and partner in crime, he sets off on an adventure to defeat the Demon God before it can bring the game to an early and very unfortunate conclusion.