I think it’s his Japanese age. So he’s 18 for his international age (what he’d be in America), but 20 based on the way they do it in Japan? I could be wrong, but they do it like that in Korea, so it might be the same.
That is korean age, Japan has international age, the only weird one is Korea
Makes sense. Do you know why the manga is like that?
? Where does it say hes 20 because Seijiroh says hes underage and in highschool??
Nowhere, he is in high school in the beginning in the last one he graduate and they have sex for the first time because "he is an adult now" and in the extra he is in uni and they plan to live together when he graduate uni and get "married" in Japan (the adoption thing that gay couple's do because gay marriage is not legal yet in Japan)
Hope this help the confusion
Do Japanese have that kind of culture i thought only korean have that ??
the real question here is why is the uke 20 in highschool, couldn't the author just make Ryou a university student.....like why they making the story sus for no reason