I read it a couple years ago and it starts off with maybe 5 guys as a group of friends (or maybe they are teenage delinquents but not as sure this is the case) who had grown up and are now drinking together near some railroad tracks when they are then transported to this massive stone building and are then told they must kill a certain amount of others with some guns. The MC meets a girl there and teams up with her I think, it's quite a psychological type of manga with dealing with murder and friendship. I remember later on they get transported to a kind of rich pool party thing aswell where there is some kind of established hierarchy. Help with finding the name of this would be greatly appreciated, thanks!

It sounds like GANTZ

wine baths?

No, I realise they seem similar but the beginning had many in a friend group with the vibe being overall quite nihilistic as they're drinking.

Alice in Borderland

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