I dropped at 3.1 but a plothole I'm seeing (could maybe be translation issues) is that MC was gone in the isekai world for 180 years, and like, WTF? How the hell are MC's follows still alive? Unless they all have an ability to expand their life, they should just be dead from old age, hell literally one of the follows we're introduced pretty quickly is a animal girl ans her ability is very much no extended life span
And given how loyal MC's follows are why would they just sit back and allow their organizations name to used like a public water fountain? Its not like they were order to stand by and wait for MC to returned, because he very much was isekai back to earth instantly after killing the demon king