The Anime Lad
Al Wayne wants to cultivate fields, not become a hero. By improving his agricultural skills, he somehow maxes out his overall abilities. Demons and monsters threaten the peaceful farming life he wants, leaving him equipped to intervene against his preferences. Professional specialization has produced an unreasonable amount of combat readiness.
Super Eyepatch Fox
Al dedicates himself to literal farming until improving those skills maximizes his overall statistics. He wants an idyllic rural life, but demons and monsters threaten the realm around it. The fantasy comedy pits overwhelming ability against a protagonist whose actual ambition is to keep farming.
Gigguku
Al only wants to farm, yet mastering agriculture makes him ludicrously powerful! His peaceful goal collides with demons and monsters invading the realm, so heroic ability becomes another obstacle between him and the fields he wants. The premise commits fully to farming as both his passion and the source of the problem.
Father's Basement
The connection between farming practice and total combat power makes no sensible claim to balance. That is also the premise’s useful joke. Al becomes stronger than heroes while wanting none of their role, then faces monsters capable of ruining the quiet agricultural life he was actually working toward.