As one of the game developers of an upcoming fantasy RPG, Kurimoto Haruma is responsible for bringing it to life, but while working overtime, a mini black hole suddenly appears and pulls him straight through. Next thing he knows, he awakens in an oddly familiar forest, and it doesn’t take long to realize he’s been transported into the very game he’s been working on.

Despite knowing how the game works, it all gets thrown out the window when he realizes something went wrong with the summoning. His appearance is warped between his former body and the protagonist, he draws his sword out of his head, and every skill breaks the laws of physics.

Worst of all, Haruma screws up the game's storyline and is now treading an unknown route, but as time goes on, he discovers an alarming amount of new lore:

The alleged villains aren't so bad.

His companions can also cause plenty of trouble.

And there's a real mastermind behind the prologue kingdom's fated collapse.