In the last published WN chapter (back in 2022, I don't know if author finished it), author wrote:
"This work won the "CW Manga Award" at the Kakuyomu Web Novel Contest and has been chosen to be made into a manga!
We will contact you with more details shortly, so please look forward to it!"
Actually it doesn't have an LN as far as I could see, but it does have a WN. So it is a direct WN to LN adaptation. Which doesn't make sense if it is supposed to be an advertisement.
Huh, did an arc got cut? My memory might be faulty because I read the web novel(?) probably like 3-4 years ago? But I remember there being a story arc between returning from her parents and the academy.
Nope:
1) drinking age doesn't equal purchase age, so you have countries where you can drink alcohol no matter the age but you can only buy alcohol at X age.
1.1) there are also countries where age depends on the type of alcohol/alcohol content etc.
2) in any case, both (drinking and purchase...
@trapsarebetter nope, they didn't need prove anything, waitress misunderstood and thought that she will help him in progression of relationship or something like that.