I'm going to be upfront first, though: This anime is exceedingly standard for the isekai genre. It honestly doesn't pull many punches in terms of originality at all (though the bi? gorilla girl is a great touch). But that's okay. This was an anime I watched to relax- it's mindless, and not super deep. It's also not super fanservice-y, which is appreciated. MC is clueless, as usual, but not exceedingly so. He has brain enough to figure out obvious solutions within the episode. And as far as harems are concerned, this is one of my favorite relationships. Personally, I'm tired of every girl in a harem fighting each other constantly, and seeing that not happen, with them rolling with the punches as they come, is honestly really refreshing, at least in my opinion. On that note, I will say I wish they'd focused more on the story than the harem building, but this has ended in a way that is super open to a part 2 or season 2, and I think there's a fair amount of potential where the story is going. I also rather like the way Seiichi's overpoweredness is presented as a sort of gradual increase (that he doesn't much care for) as opposed to how it is shown in How Not To Summon A Demon Lord, for example.
I could go on, but I'll boil it down to this: If you're looking for something quick, enjoyable, and funny in a mindless sort of way, then Shiranai Uchi ni Kachigumi Jinsei is for you. If you're looking for a fresher take on the isekai genre, then you should probably look elsewhere.
