SSS Awakening: I Can Class Change at will

In a world ravaged by apocalypse, humanity faces extinction, armed with a game-like system and a rite of passage: the awakening ceremony at eighteen. This event grants individuals a class and access to the First Sanctuary, a brutal realm where life is a commodity and power is forged in combat. Moon, however, appears to be a casualty of this new order. Branded a Null during his awakening, he is ostracized and deemed powerless, even abandoned by his girlfriend. Yet, fate intervenes. Moon possesses two extraordinary, world-defying abilities. His talent, Grim Reaper, grants him five times the lives from every kill. Furthermore, he is Classless, unbound by the system's limitations and able to learn any skill through comprehension or fortunate encounters. Starting from the lowest rung, Moon utilizes his unique power to master any class and amplify his strength with every fallen foe. He embarks on a quest in the unforgiving First Sanctuary to defy expectations, carving his legend through sheer will and bloodshed, transforming from a worthless outcast into an entity of myth.