So far, the list of best girl to worst is
1. Murasaki Shibuki Sensei (Best)
She geninuely respects MC and, perverted tendencies aside, they both will hear one another out and work through issues. They're much more functional as a couple than any of the other two, even if they're doing some risque things on the side
2. Iroha
Whilst she's close, her teasing can go a little TOO far to the point of extremes and MC constantly has to tell her to stop or that he doesn't like her. Even though she's probably gonna win, I don't think she should because her relentless pursuit is a bit...Off-putting
3. Mashiro (Worst)
She's just a straight-up bitch. It's not even a case of tsundere, because if she's hiding her emotions under a veil of hatred, what she's doing is bordering on abusive. She not only jumps to conclusions without hearing MC out but she degrades him and shuts down any attempt he makes at getting close to her constantly. She'll need a massive arc to shift her personality if I'm supposed to view her as a viable rival. I know it's implied she's jealous when MC is with the other girls because of the glares she shoots at them, but she could at least try not to be such a nuisance to him.
I think that actually would be best considering they're the only two people that haven't tried to blackmail, bribe, and/or forced one another's hand in some way
@justforthelulz