This is worse than I thought. By choosing to build a wall surround his village, go solo against the monster stampede and later the demon, without telling anyone, this retard MC, technically, become a traitor to his kingdom. With his knowledge and his connections in his past timeline, he could have gone to the Adventurer's Guild or go to high-rank military member that he knew, trusted and ask for reinforcements. Even if they didn't buy his monster stampede "bullshit" , given his village was near the kingdom's border, they would still mobilize a squadron to his village. 90% the demon attacked on his village was also served as a distraction , and god knows how many demon and spies from the other kingdoms had already infiltrated during the commotion.