Raisel, summoned one day as a hero, was exiled due to a misreading by the combat power assessment device.

However, in reality, he possesses overwhelming strength, unmatched even by 100 of the world's top-tier combatants combined.

After his banishment, during his travels, Raisel discovered that not all demons were evil and decided to join forces with them.

By the time the world's power dynamics are overturned and they realize his true abilities, it will be too late.

The demon race, allied with Raisel, would rapidly flourish, while the kingdom that exiled him would swiftly fall into ruin.