Hilarious. The cringe factor is real
Mc gets assimilated with his chunibyo game character he made as a kid. Op skills of being able to do anything once he sees it once and a dark backstory of a demon killing his whole family which forged him into a demon hunter.
Unfortunately the demon hunter class is weak against anything besides demons and was thus deemd a trash class. After all the other demon hunter players were killed, MC became the last demon hunter.
The Player Hides His Past