Let's be honest here. Oyakado was decent enough at drawing up a somewhat interesting story about monster girls in our modern day society with enough soft-core porn to make people stick around. It was a story that spoke more to our boners than our minds, still, it was somewhat interesting in terms of "plot" as well, at least it wasn't boring to read whenever boobs didn't pop out everywhere. It was pretty funny at times as well.
However, what we have here is just, at best, a low-level shounen battle manga made for kids or rather young teens with the addition of some ecchi poses without any truly erotic stuff. While there are still boobs, it's much less graphic than monster musume no iru nichijou. It reminds me a bit of the early days of "to love ru" in terms of ecchiness, just less interesting.
The characters are mostly recycled from his other manga but they lack the personality they previously had because of the forced "combat" and "drama"(if you can even call this subpar stuff that). The mc is just unlikable and boring, I never did like the combination of someone being OP yet at the same time timid and lacking guts as well as motivation. I guess the author thought he'd be amusing with his wishy-washy attitude, something which couldn't have been more wrong. I really dislike the idea of him having some kind of even more OP brother that is clearly better than him in almost everything and has already travelled to this world before. Someone chasing after the ridiculously overpowered shadow of a family member to later on become as powerful or more powerful than them is freaking overused and a really, really bad setting. It's so bad that it pisses me off.
Then there's the setting... Oh, god. Maybe this has to do with me no longer being 10-15 years old and having read so much as well as usually reading way more mature stuff, but it really makes me cringe too much. So, some random world seems to be attached to our world or whatever. Then the mc just happens to go there after being fetched by someone who adores his brother. Of course we need a lot of ugly and ridiculous robots to be the enemy and enemies that pilots them. A lot of games shown as well, seems that the whole robot invasion thing is just a game for these people as well. As if that wasn't enough, we also have to throw in a lot of utterly shiver-inducingly bad english that the author thinks sounds cool. Like live earth, the name of that other earth. No, not even to the point of using "live" as in "live-broadcast", no, it's "live" as in living. Then there's weird race categories because we couldn't have just went with the standard "humanoid" "monster" "demi-human" or anything else. Does seem like they have proper race names though, like the harpies.
Well, there's a lot to say, but let's finish it here. In the end, this author failed badly while trying out something new. The comedy is dry, the story is ridiculous while also being boring, the characters feels flat and the fan-service which most of us are here for(because let's be honest here, the main attraction of this author's works are the pretty much softcore porn). Giving it at 3/10 is me being generous because I know that this was intended for younger audiences that prefers flashy bullshit without substance or thought put into it, things that "sounds cool".
I feel like this author would've done WAY better if he decided to make an isekai fantasy slice of life manga. We experienced the modern day version, why not go for a heavy fantasy one as well? That would've been the best choice. Sadly, this author took the route of a half-arsed parallel world bullshit action manga which lacks in pretty much every aspect because it becomes spread too thin when you try to put everything into it. Also, this author was also never skilled at writing action and drama and shouldn't even try.
You might enjoy this if you're a teenager and haven't experienced that much stuff like this already.