Dungeons suddenly appeared around the world, resulting in the awakening of humans. Those who possess skills are called Colored, meanwhile those who are excellent are granted the title of Mage.

Kurosaki Rei, who has no skills, is discriminated and called Colorless.

Compared to him, his brother who is recognized as the Purple King. Regardless, Rei couldn't give up his dream to become a Mage.

10 years after the first appearance of the the Dungeons, a powerful entity emerged and threatened to destroy the whole world. The entity is known as the God of time and space. Against the overwhelming power of the god, Rei had awakened a skill called Skill Drain, and then stole the power of the god....!

Using this new power, he gained the power to fight against the time itself and flew into the past to start over everything.