I don't think Kana would be supporting Riku this much if she knew he also started dating Haruno and is technically two-timing both her and Ayana. Hoo, boy. I still don't know how this hasn't been axed yet. One of the rare times I would've been happy to see a manga axed, and axe-kun should've visited immediately after Riku and Ayana started dating.
I'm starting to suspect that maybe this was some black history story the author started writing in school, shelved out of cringe and then unearthed out of desperation and published as a novel, and later adapted to manga to make a quick buck.