Tensei Kaku Gamer: Ouji demo Kateru Isekai Kouryaku

A middle-aged fighting game player, Kairu Mitsushima, whose life was changed in the past by an encounter with the "living legend" of the fighting game world, Daigo Umehara, is reincarnated into another world after a traffic accident... There, he finds a brutal world where battles are fought using the knowledge and skills of fighting games...!?