The world used to be a simple place.
You study, make some friends, get a girlfriend, study some more, get a job, get a wife, make some kids & die...
More or Less.
Then on the first day of his college Jason & the whole world gets a terrifying surprise.
Their Universe is invaded by Empyrean Heavens, all planets with intelligent life are transported to other universes.
Natives have to increase their strength to fight the invaders or be at the mercy of invaders.
Among all this chaos Jason is judged unworthy and too weak in terms of genetics and body to enter the tutorial.
But He defied & challenged the heavens and Heavens gave him an impossible trial to get strong.
Hence he came out as Cronus Empyrean.

Rise of Cronus Empyrean