I think that there should be bonus points given to schoolgirl yuri that takes place in a co-ed setting, because then there's not the old excuse of limited options and having "they aren't really gay, just practicing being girlfriends for when they get a boyfriend after school" style plots.
Imagine being a girl who all the boys want to be with and all the girls want to become like, who is evading the attentions of the boys because she likes girls, and is searching for another girl who'd return her affections, rather than one who just idolizes her platonically and seeks only friendship.
She could try different methods of finding other gay girls in hiding, with each one having its own share of drama and comedy, the crisis is that among all the girls who admire her, shes looking for the ones that are down to fuck. the main character appears chaste and innocent as she shows no interest in dating boys and refrains from.even discussing them sexually, but part of that is the misconception that she is straight.
in her dirty mind shes a degenerate pervert dyke who wishes for a yuri harem of 100 girlfriends or more from different archetypes and stereotypes and fetishes and fantasies from eastern and western cultures.
she dreams of massive orgies with her girls only harem, or having them gang up on her, her fantasies involve a realm of female sexual pleasures that even a cenobite, sensate, or slaanesshi cultist would consider a bit much. unlike most yuri heroines, this one isnt the delicate kisses hesitantly delivered after a session of handholding type, nor is she the type to be ambiguous at all to the audience about what she truly wants. shes very open and direct to the readers and explicitly lustful with a pornographic mind (programmed by her own unfiltered access to the porn of her choice when she was a child just discovering the true nature of her like for other girls and women, and distaste for boys as anything more than friends. we witness her inner workings firsthand.
one example is her elaborating how how people might say to her that two girls is limiting in bed, as "theres no dick", she says there are a great number of dicks, all shapes and sizes, while straight girls just get stuck with what their boyfriend happens to have, plus if its twosided both girls can enjoy it together.
shed say things like how straight girls with two bfs wont get a double cunnilingus unless the guys are bi, but gay girls with two gfs could since her gfs would be into each other as well.
or that other girls would be better lovers since they know the female anatomy.
shes not talking about things like how dating girls is better because of what they do outside the bedroom, her mind is in the boudoir.
the problem is that shes forced into a closet by her zaibatsu family, as being a school idol she is not only practically perfect in every way, shes also stupidly rich, but her family only considers her worthy if they think shes going to not bring shane to their name, which means they are grooming her to marry a man and produce heirs with him.
lucky for her, she choose from amongst her selection of childhood friends to get arranged to marry a guy who is her genderswapped counterpart.
that is, seemingly the perfect guy who keeps the lustful ladies at bay, secretly a fag who wants a yaoi harem of 100 boyfriends to xxx with, but cant seem to find anything but heterosexual (though wierdly homoerotic) gymbros (<thats his "type" of guy). Hes basically trapped in a jojo story without the battles and magic powers. so she has a "beard" to keep her father (the official head of the family zaibatsu) and mother (the actual head of the family and company) at bay.
dont worry, he doesnt show up very often and is mainly played for comedy. though he is seated next to her, fittingly, in the "protagonist seat" positon. and her in the "heroine seat".
the joke is a traditional yuri heroine on the outside tomoko kuroki on the inside. with many elements that make fun of yuri tropes and spoil the fantasies of both male and female fans, holding them up to reality in the same style of watamote.