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

A tabletop RPG enthusiast is reborn in another world after being tasked with saving it from destruction. Given the world's rulebook, he begins his life as a farm boy and aims to create an unbeatable character build. Despite his experience and high-level skills, he finds that survival in a feudal society is difficult, particularly as he attracts increasing unwanted attention. He must learn to adjust to his new reality before his personal flaws derail his mission.