If mayumiko WERE to happen and GSNK was a different vibe of manga GOD would I relish in the angst and pining. Mayu starts opening up to Mikorin more as himself and through this process Mikorin realizes he has feelings FOR Mayu, eventually Mayu confesses that he’s been talking to this girl online and shows Mikorin his chats with her, Mikorin realizes their identities- BUT THIS IS A BAD THING. Mayu is infatuated with the very curated version of Mikorin- he will be filled with immense guilt for deceiving Mayu (Mayu has been doing the same thing but I think Mikorin would feel more guilty) and also jealousy of himself. Following the og silliness I think Mikorin response would be to start cyber bullying Mayu or acting like a creep or some shit as his girl persona to make himself look better compared to his girl self.
The manga would probably skip all this angst tho. Mayu and mikorin would tell eachother that they’re talking to girls and describe them to eachother. Mikorin would be like “wow this girl sounds awesome you should set us up on a double date!” (Of course he would want to go on a date with himself) Or vice versa. This digs the other into a hole. What happens is Mayu cross dresses, ATTEMPTS to adopt the personality of Mikorins girl persona (but this is still Mayu so he would do it in way less words, there ye still being clearly Mayu), and shows up ona. Double date with Mikorin. It is so obviously Mayu but Mikorin gets so nervous around girls that he never makes real eye contact with Mayu . Mikorin has a great time, and Nozaki is using this all for manga material and is somehow incentivizing Mayu. This goes on until Mikorin can work up the courage to express his feelings for his girl and really look into her eyes-at which point he realizes it’s Mayu in a bad Temu wig.