>>95905466
Chaos Dragon
It's an anime that is based on a replay series of an RPG game that Urobutcher (Madoka, saya no uta), Nasu (the fate/ man), and Narita (the Durarara/Baccano guy) and some other author I don't know about as the players.

I enjoyed it. Was unfortunately one of those anime from around 2015 that were really made to promote the other material, so its only 1 season and the animation is a bit low budget for the time (some things are CGI and kinda jank in places).