Unfortunately this isn't the first time I have seen this kind of plot device in manga. It's pretty strange, considering alcohol consumption in Japan is quite commonplace and not exceptionally low, so it's not like light novel authors/mangaka wouldn't know their stuff. In other words, it's not like firearms, for example, where a mangaka could be pretty much expected to never have held a gun in their hands, considering Japan's extremely draconian weapon laws. Or how Japan's high pacifism has made the average mangaka quite blissfully ignorant in military matters.
I'd categorize it more under "exaggerating the effects of an illness/drug/placebo effect beyond anyone and everyone's suspension of disbelief with wild abandon just to set up a horny/romantic moment."
There are people IRL who can be drunk with just one beer. There are some kind of cake that have a decent amount of alcool and use strong alcool, enouth for people who are weak and never drink to be tipsy.
The USA is the most armed country in the world and the entire Hollywood nearly always mess up all the military and weapon handlind aspect of their film. It's the same for TV show and comics.
If I remember correctly, she is the one who cheated on MC, then spread bad rumors about him at the IT company he worked at. He got depressed, quit his job, found Nina the Vtuber, then started working at the convenience store once he got bit more energy to live again.
Funnily enough, from a biological standpoint, asian people in general are more susceptible to being drunk, since they have a less effective alcohol metabolism due to a mutation in the CYP2E1 enzyme present in asian population, which leads to higher concentrations of acetaldehyde in their bodies, which is believed to be the chemical associated with alcohol's toxic effects (after all, getting drunk is still getting intoxicated, regardless of how well accepted it is socially).
i had a rhum cake called a baba au rhum, its just cake drenched in rhum so maybe its like that where the alcohol isnt cooked,
