Tensei Kaku Gamer Oji demo Kateru Isekai Kouryaku

The story centers on Kairu Mitsushima, a middle-aged man who has been good at playing fighting games since he was in middle school. 30 years ago, he had a life-changing moment when he met Daigo Umehara, a living legend in the fighting game world. After a traffic accident, Kairu gets reincarnated in another world, where people battle it out using their knowledge and skills in fighting games.

(Source: Anime News Network)