TLDR: The One Punch Man of isekai
Honestly, that's all there is to know. The MC is an apathetic entity known as the Alpha Omega. He can will you to death. Some flashbacks to his origins are given. It's an Isekai. He gets zapped into another world and the adventure begins. You ever wondered why the MC didn't stop a particular person or monster or just use his superpower to get past that obstacle...Don't! He does. Its carnage from the get go. The animation, sound, voice acting, pacing, etc are all average. The story for all its mediocrity is fun enough, but it's given that extra edge with the MC. Basically, if you didn't like One Punch Man, then is not for you but for the rest of us,, trash loving isekai fans, this is the hero we always wanted.