It started out good. Mysterious world, MC with overpowered ability but weak at the beginning etc. are all good points. But the way author structured the story progresion is very disjointed. He jumps from one scene to other without any exposition as to why it changed or what's happening. For example, around ch.46-50, MC was contacted by a mysterious shadow figure who told him about the extraordinary world in exchange for him to kill(?) a girl. Then the next chapter suddenly changes to the school picnic where there was a accident of a student falling in lake and gets rescued by someone and that person happened to have fish scales body and MC shows him his skill of summoning the blood angel, wtf? It feels like author has too many ideas and doesn't know which direction he should take the story towards.