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

Summoned beyond the grave to rescue a dying world, a devoted tabletop role-playing enthusiast finds himself reincarnated as Erich, an unassuming farm boy. Yet this new life comes with an extraordinary advantage: he possesses the very rulebook that governs reality itself. Armed with decades of experience optimizing characters and exploiting game mechanics, Erich sets out on an ambitious quest to craft the ultimate, invincible build. However, raw statistical power proves insufficient against the harsh realities of his medieval surroundings. Even after rapidly leveling his abilities, navigating feudal society demands far more than number-crunching expertise. His rapid ascent inevitably attracts unwanted scrutiny, drawing dangerous attention from forces he may not yet be equipped to handle. Erich must learn to temper his obsessive gamer instincts and adapt to a world that operates on more than just dice rolls. If he allows his worst habits to dictate his actions, the most important campaign of his existence will spiral into disaster. With the fate of this realm hanging in the balance, he has no choice but to embrace the unknown and let fortune decide his path.