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An apocalypse descends on the world. Several portals that could connect to different dimensions suddenly appeared on Earth. Various monsters and magic beasts that reside within this portal were finally finding their way to crawl out to the human world. 
Awakened humans rise to defend their world. Mages were being nurtured, getting ready to invade dungeons. 
Sebastian Blake, being from a poor family, was forced to survive instead of live; he finally lost his life in prison as he was paying for a crime he didn't commit. 
However, he suddenly woke up in a white dimension and heard a voice. He looked up to see a holographic display in front of him. It was a system. 
The system suddenly began to type some words to him: You have two options. 
1. Accept the system and obey its rules; that way, you will live. 
2. Decline the system, and your heart will stop beating in the next five seconds. 
 
Sebastian has been given a chance to live again. into a world filled with magic; however, even he didn't expect to be chosen as a candidate in the magus academy when he literally had no magic. 
It didn't take much time before he understood the system that awakened him. As he carried out his daily missions , he found out that magic has no limitations for him!