i ussally love all manga exept the hentai ones with a shit story im esspecially a sucker for isekai's and harens but this is just ... kinda shit ... just really fucking boring
The most basic requirement of a story is to have conflict that challenges the protagonist. If you're going to have the protagonist be an unbeatable fighter, then the main conflict can't be constant fighting or the story gets stale and boring. Oh well.