After losing his grandparents, the last of his family, a young man named Kariya finally has the chance to leave his isolated mountain village. But the wider world he steps into is consumed by war, and he is immediately conscripted into the army. It does not take long for Kariya to realize the terrifying truth: this world is a near-perfect replica of a massive multiplayer online game he played obsessively in his previous life.

When his identity as a reincarnated player comes to light, Kariya is given a desperate mission. He must escort Wald, a handsome prince disguised as his own twin sister the princess, safely through enemy territory and back to the royal capital. The journey forces Kariya to rely not on brute strength—his combat abilities are those of a common, non-playable character—but on his deep knowledge of the game’s systems and his skills as an S-tier craftsman.

As the mission progresses, Kariya discovers he is not the only one who knows the secrets of this world. Other reincarnated players are out there, and their intentions are far from noble. The initial arc focuses on the perilous escort mission itself, establishing the tense cat-and-mouse dynamic with enemy forces and the growing bond between Kariya and the disguised prince. Later narrative arcs expand the scope from mere survival to a larger conflict, as Kariya uses his unique crafting abilities and foresight to turn the tides of battle, protect his companion, and uncover the reason why so many players have been reborn into this game world.