Not just her, some of these heroines really have nice male side characters they could pair up with (like Banchou x all-I-have-is-strength man / the guy who dropped out of school, Tsubaki x Iinuma). Only ones who really lack a partner are the 2 Onishima heroines Yui & Raino.
Edit - Huh, the next...
Part of what made this manga exciting is seeing the subtle hints from the beginning that Kanna is an absolute psychopath, possibly brain damaged, who only appears to have human emotions because people see her acting deredere for Rokudou.
Not sure how I feel now that she apparently actually does...
Halfway through the chapter: Wow, that's some visual. Rokudou of the North Star. Surely the most impactful page of the chapter.
Near the end of the chapter: Okay, I stand corrected. Hard to top a surprise dominatrix.
This arc was great, but it would've been a lot better if Osanada wasn't ~3 feet tall. Hard to take seriously the idea that she's a high school student, much less that she punches like a freight train.