The idea of teaching as the focal point for a story is good, but the author obviously didn't know how or want to follow through with it. The end result is the most generic slice-of-life action isekai that has ever existed. MC is a literal god who can destroy the planet by waving his hand around, but the twist is he's old... Are you laughing yet? The teaching element gets throw out the window almost immediately and instead we get generic shounen style action and random isekai nonsense. I wouldn't be surprised if the author just went A to Z from their bookshelf looking for stuff to rip off.
