Oh good, selfish mentally-stunted yandere about ready to throw her Main Girl weight around and elbow out the kind, loving girlfriend that puts her bf's happiness first.
I'd be nice if he actually stayed with the girl who deserves him instead of forcing in a sloppy "oops I guess I suddenly fell in love with the MAIN GIRL, no wait I was in love with her all along, yeah, that's the ticket" relationship upgrade in the last chapter.
Also can I once again point out the irony of all the Satsuki fanboys cheering her on for this stunt, but if the positions were reversed and Ishihara confessed to Satsuki's Boyfriend Naoto, they'd be frothing at the mouth in rage?