Yaoi

There's probably something about yaoi that makes the stories move faster, therefore confining them to one volume. Or maybe it's an editorial decision. I think that many yaoi manga aren't exactly affiliated with a magazine and serialized on a weekly basis. But if you want to read some yaoi manga with longer stories, I have a recommendation!

http://www.mangago.zone/read-manga/hitorijime_my_hero/

Thanks. I read both of them, lol. I loved the anime also.