The Fracture System

After a reality-shattering event puts him in a two-year coma, Rin Matsuda wakes up to a world straight out of a video game. Dungeons, monsters, and super-powered “Hunters” are the new norm. While his best friend has become a famous lightning-wielding hero, Rin awakens with a glitched and bug-ridden power—the “Fractured System.” To level up, he can't just kill monsters; he must hunt reality-bending “anomalies” and survive deadly trials with a ridiculously high chance of death. Seen as an error by his own system and unawakened by the world, Rin must embrace his broken abilities to survive. — Description from novelcodex.org