Born as the younger brother of a brilliant hero, Yugu has spent his life following his older brother's commands. However, during the final battle with the Demon King, Yugu defies his brother’s orders to save his comrades, resulting in his brother suffering a devastating injury, losing his arm.

Filled with regret, Yugu rushes to his brother’s side. But before he can do anything, a mysterious magic circle appears, and he is suddenly transported to an unknown world...

To save his brother and surpass him, a mere novice mage embarks on a journey through a new and unfamiliar world.