When I read prison school the comment section was exactly the same, idiots who didn't understand that the story is a COMEDY, everything else for the author is secondary, he doesn't care about your fucking shipp, he doesn't care about the protagonist's romance. He might end the story with the chiaki dating usb-kun, don't be surprised. Accept the story as it is, a FUCKING GAG, A COMEDY, not a romance history ffs, if u keep laughing the manga is doing great.
stop looking for something that is not the focus of it.