Tensei Kaku Gamer: Oji demo Kateru Isekai Kouryaku

Kairu Mitsushima, a middle-aged fighting game player who had his life changed after meeting Daigo Umehara, a "living legend" of the world of fighting games, is reincarnated into another world after a traffic accident...This world turns out to be a heroic world where battles are fought using fighting-game knowledge and techniques...!?

(Source: Shueisha, translated)