Most people, or at least I, would go into this expecting some kind of a badass dude who went all the way to the top of the world, perhaps one of if not the strongest with lots of experience, then he gets pushed away and now he lives for himself in his second summoning, quickly regaining his powers as he goes around on adventures and that the focus is comedy since drama isn't so applicable where you're OP.
Sadly, while it seems something like that at first, it quickly betrays expectations. It turns out that he has a moronic policy of "not killing anyone" this time around. Yay. This wouldn't have been so bad normally since he'd be OP anyway, but introduce enemies that are like cockroaches that he just spares all the time and we have a "wonderful" formula where the mc is a god damn pushover that lets ridiculously dangerous people back into the wild every time after they almost kill those close to him and they just keep on coming while doing their best to be disgusting about it. If it was just a wacky comedy, it would've been fine not to kill anyone, but this manga fancies itself something akin to a drama/comedy/shounen battle mix and thus it all ends up a horrible mish-mash of bad choices. If he was a bit more realistic about it, like "I'll not kill innocent people" or "I don't kill people who don't try to kill me or those I care about first but if they try, I'll come in like a god damn momma bear", then it'd be fine. But no, let everyone go, no matter their actions, insanity and danger levels.
Doesn't help that since the mc is already OP, the ones getting the plot armor ass-pull power ups appears to be the enemies. Because you can't create drama otherwise when the mc and his friends are so powerful, right? Enemies always seem to escape, usually due to the protagonist team's slack attitude, how they clearly absolutely don't want to kill even when the situation demands it and not going full power. You'd think they'd learn after it happens once or twice, but not these guys, they're simply not intelligent enough. It really doesn't help that said villains/antagonists are all self-pity cases, essentially extremely immature people who act only on "A few people harmed me or I was disillusioned for some reason so now I want to destroy the world and subject everyone to similar suffering or worse than what I, myself, experienced and despaired over. Because it's fine when I do it, but not when it's done to me and everyone in the world is guilty for what a very minor group did" kind of "logic".
Nah. Too bad since it showed some promise, I really do enjoy OP protagonist to self-insert as, kind of a guilty pleasure. As it is, however, this story is nothing if not juvenile and cheap on all fronts. It strikes me as something a pushover chuunibyou would write, they want the mc to be powerful and cool but somehow want battle scenes and weird drama too. The mc himself does indeed act like a delusional middle schooler. This story is cringe incarnate, every single piece of it radiates cringe on an atomic level. It's far from limited only in battle, pretty much every dialogue is also so cringeworthy. The mc tries to act cool and "coolheaded" and everyone else overdoes every line they have, they rapid fire cheesy lines as if it's nothing, no matter if the timing is right or not. The anime somehow managed to be even worse than the manga though, quite a miracle that they changed things to be even more cringeworthy.