Magic User: TRPG de Sodateta Mahou Tsukai wa Isekai demo Saikyou Datta.

A man in his forties, who was once a tabletop RPG fanatic, has settled into the ordinary job (and life) of a salaryman. All of that changes when he's tossed into a parallel world by a mysterious entity and finds himself in the form of Gio Margils--his max-level wizard character from the classic tabletop RPG Dungeons & Brave! Can he successfully rise to the role of a hero when he's living as his wizard PC? Don't miss this light novel adventure for gaming fans both new and old!