Just a heads up that this is my first review that hasn't been written in the notes in my anime list or on a small Discord I'm in with my friend's. Not that anybody actually reads them but oh well.

Oh and this is a review based entirely on the 10 episode anime and it's OVA though the OVA does have a proper review over on it's page too.

This is a somewhat surprisingly good anime considering it's an isekai and most people seem to assume that most isekai anime are the same and past their prime but I still found this one to be quite refreshing in a way.
Yes it does have the usual main male character (Izayoi Sakamaki) with some pretty strong powers with lots of girls around them but it isn't a harem show and he's not completely overpowered from what I've seen in the anime.
I specified "main male character" as he isn't the only main character he just so happens to be the only male among them; Asuka Kudou, You Kasukabe and Kuro-Usagi being the others.

The basic plot is that Kuro-Usagi summoned the other 3 MCs to help her rebuild her community; a sort of adventurer's country if you will. They have their own land, flag, name and members.
However, in this world called "Little Garden" you compete in "Gift Games" which are tournaments of varying sizes with some kind of prize the line for both participants (whether this be individuals, groups of communities). Kuro-Usagi's community lost their name and flag and are now referred to as the "No Names" and the anime centres around the 4 main characters working together with their new community to reclaim and rebuild what they've lost.

The characters themselves seem to have plenty of back-story too and each of the 3 summoned MCs (Izayoi, Kudou and Kasukabe) come from different worlds where certain events happened in each of their worlds at the same point but other events are unique to each world (so things such as "The Black Death" aka "The Bubonic Plague" happened in each of their worlds but other things may be different). In addition to this they are also from different times in their respective worlds so Kudou is from a kind of modern-ish Japan-like world from the looks of it, Kasukabe is from some kind of fantasy world with floating islands and Izayoi is from a slightly different modern Japan complete with delinquents.

Overall I'd say that if you have an interest in isekai anime and/or are just after something to sink your teeth into for a bit you should definitely give this anime a go if you can but you may end up disappointed when you realise or remember that there's no more to the anime after the 10 episodes and the fan-service OVA.

In terms of "best girls" you've got a selection as there are lolis, slim girls, busty girls, vampires, animal girls (bunny girls, nekos, etc.) and more to take your fancy and a large amount of them are featured in the OVA which I'll get to in a moment.
I quite like Kudou which is surprising considering she's an "ojou-sama" type but she's actually quite mellow as you'll learn in the anime (I won't get into spoilers but each has their own reasons for leaving their original world and goal for their new one).
I am however torn between her, Kuro-Usagi and Leticia

The OVA is your fairly standard fan-service OVA which was bundled with volume 7 of the light novel shortly after the anime aired.
It includes a variety of fan-service "gimmicks" including milk, clothes in the process of being removed, school swimsuits along with ones that are similar to school swimsuits, melting clothes and more.
It has it's own mini-story/competition independent of the main 10 episode anime but requires you to have watched them as certain abilities, characters and whatnot are present that come into play throughout so unless you just want fan-service and won't watch the anime or don't mind being spoilt you should watch it after finishing the main series.

Just to reiterate; this is a great anime in my opinion to the point where I've written a review for it but sadly it seems like it's been forgotten about and therefore unlikely to get any animated sequels any time soon if ever...
If you miss the characters and setting you could always try reading the light novels; all of the main series has been translated into English and some of the sequel series called "Last Embryo" is translated though the group recently dropped it (not long before this review too so it's possible it may have been picked up by another group by the time you're reading this).