TRPG Player ga Isekai Saikyou Build wo Mezasu: Henderson-shi no Fukuin wo  

A person who was commissioned in death and tasked with saving a world is reborn as a farm boy, but has access to all the rules for their favorite tabletop RPG. To become an invincible character, Erich will need more than his experience as a munchkin, which involves number-crunching skills. Life on a feudal farm can be challenging, especially when you attract unwanted attention. It is important for Erich to adapt to this new world before he allows his impulses to derail the campaign of a lifetime. The outcome will depend on how the dice fall.