Take them out on a date, have a good time, then gradually edge towards "Will you be my girlfriend?" or "I like you, and I like spending time with you, and I'd like to spend more time with you." you know? Not just "I like you, go out with me." and BAM you're a couple now.
lmao dude, this is manga. also they love each other and in manga "mature confession" are rare unless the manga is pure fluff. in this manga i think its more like, ""im sadistic, you're a masochist, wanna do S&M together? oh also lets be girlfriends"
Well not just in manga, don't they do this shit in dramas too?
Kinda feels like that might be how they do things, culturally perhaps. Like a formal announcement/request
Hell, this is kinda how real life goes (after you get out of school, that is). Start spending time w someone, pretty soon it's lots of time and then you're living in the same house, etc. The only really formal "confession" after school is pretty much: "Will you marry me?"
Is it cultural? It seems like the Japanese tend towards compartmentalization, so there are divisions between "friend" status and "girlfriend" status, which applies to other parts of life as well. So the "confession" acts as a definitive changing of what box you fit into. In the west, this isn't such a big part of culture in general and things are looked at in a more fluid sense, including romance.
Not that there aren't exceptions in both cases of course, and cultural attitudes themselves have a way of shifting.
After you get out of school, it's pretty much like I describe it. (Unless you're from one of those old fashioned or very wealthy families where you have marriage interviews, etc...)
But yeah, during school it's all compartmentalised like you say.
I dunno I think the whole "confession" thing we see in manga is super healthy, as an adult can anyone say they haven't had those moments spent wondering how someone feels about you? Id love to see a romcom where an actual "confession" takes place because im sorry sometimes you dont just bump into someone, or have so wacky story that led you to a relationship... (im sure you can tell, but a "confession" has great appeal to me, itd be amazing to meet someone so upfront/direct/brave about how they feel , tho I do admit its far more complicated as an adult )