That is nice crescendo at the end of chapter
Leave main theme aside. I can't believe that even in manga like this authors push this "Oh I'm and underage i want to drink, but a can't" agenda. I mean, this is good idea by itself but in such context it looks really out of place. Yeah, gangbangs with drugs, rape of middle schoolers, but no underage drinking? She is definitely well-mannered girl, but she is 18 y.o doing soft-porno and she drinking with her friends, so the only actual reason to refuse is her age. Wut? It's not like it's necessary to get wasted.
For some reason a lot of manga, even seinen do this shit, like some violent hardcore delinquent suddenly refuses to drink cause he is underage etc. Why mangaka do this all the time?