Don't be fooled by the title or the synopsis. The Mc is anything but Overbearing Tyrant. It's actually the exact opposite. He acts like a childish fool and doesn't even kill the villains. He spares the enemies who try to kill him who come back to plot against him again and he always forgives them and they try again... it can be said that he is like a reverse isekai guy: instead a weak/loser who gets OP, he was an badass captain who fights aliens/super-robots in the post apocaplitic high-tech world but becomes a lazy slacker ass**** after transmigred.