It's in the early stages right now, and the last few chapters are slowly trying to introduce a more in-depth story compared to the one-shot.
This is what I understand so far (pls correct if wrong, am slow)
- This specific Hero Party (Hero/Mage/Fighter/Elf/Priest) finishes off Demon King
- It just so happens that all the other countries/lands summoned their own Isekai heroes
- Now Isekai Heroes don't have a job, and most of them (supposedly) have some kind of "darkness"
- Isekai Heroes get "marked" by that darkness and it amplifies their desires/makes them go crazy
- Isekai Hero #1 wanted to be popular with girls
- Isekai Hero #2 wanted to see dragons fucking cars
- Iskeai Hero #3 wanted to have a prince harem
- etc.
- That "darkness" seems to be related to the demon magic/demon king, so there might be an enemy orchestrating it from the shadows or smth
- Hero Party is going around checking up on Isekai Heroes to make sure they don't go cray cray
- They have done 3 so far
- Currently it's setup a-la "Monster of the week" while trying to show tidbits of what's happening
Then there's the party dynamic for the subplots:
- Mage is insecure and wants to be popular (pretty much what you would expect from the common trope of fantasy MCs in manga/LNs)
- Hero is tall, tomboyish, scarred all over and pretty much looks like ikemen/womanizer but has a crush on the Mage
- Elf is intersex/futanari
- Fighter is a tomboy
- prolly has something going on with Elf
- Priest is a crossdresser, and is pretty high up