I like this manga a lot, overpowered protagonists can be great if they are used correctly, great examples are Saitama and this guy. This manga is a solid 9, hilarious, gets right to point, doesn't drag out stuff, MC isn't a retard with -1 IQ, and the FMC with the MC is good looking and at the same time, isn't an annoying tsundere or an arrogant fuck. Quite an enjoyable manga.
There are 2 problems though, one is that it's a monthly serialization, which is terrible. Monthly serialization always sucks (Attack on Titan is an exception). The second problem is that the author might ruin his own works. A story with overpowered protagonists are a hit or miss, they need to be correctly done and follow the "OP protagonist will always win rule" which will eventually be boring at one point, which is why authors try to be creative and try to think of a way they can keep the viewers attracted. Most of the time, the method they use is to introduce normal powered side characters who'll get their own story and screen time. However, that method is one of the worst ways to do it. Authors need to keep it in mind that viewers/readers first started reading the story because of the MC, so if they try to change the focus to a different MC, the story loses it's meaning and viewers/readers lose their reason to why they first started reading the story. Fine examples are One-Punch Man, Mahouka Koukou no Rettousei, and this manga. In OPM, you can see that at the start, Saitama was the main focus, that's why people LOVED season 1 of the anime, but season 2, not so much. Because the author introduced too many side characters and gave them more screen time than the MC, which resulted badly. In the recent chapters of this manga, I can see they introduced some new characters, like that Rick guy and that Rainier guy. The thing is, I don't give a bull fucking shit about their story, I'm here for the MC, if they keep shoving these pointless characters story in a chapter that comes out after 1 month, then what am I even here? After waiting for a whole month, you don't even get to see the reason why you were here, everyone would appreciate if the story goes back to what it was, when MC was just going around killing shit and trying to find a way back to their world. MC's backstory looks interesting and the chemistry between FMC and MC is good, I'd love if the story focuses at them, instead it focuses of pieces of shit I could barely care about.