Judging by what I read until now, I can only think in 2 plausible endings for this manga:
-MC will discover that glasses girl identity as "vTuber"
-He'll fall in love (person) instead of her persona
-She won't accept at first because she knows her friends are all in love for him
-The three girls will struggle with that, but somehow they'll give their blessing / admitting defeat (after each one confessing to MC) and clear the path for them to be together
-MC and glasses girls will be together in the last volume / chapter
or
-MC will discover that glasses girl identity
-He'll fall in love for her(?), but she'll convince him to choose one of the three girls
-She won't accept at first because she knows her friends are all in love for him, so she'll thank him to make her a "better person" but convince him to choose one of the three girls
-The girls will all confessing and MC and he will struggle about choose one of then
-The manga will finish with a "open ending", letting "the reader decide which girl he ended up with"
No f way the author will make MC choose just one of the three girls, neither he'll make a "harem ending" as people might wonder
Feel free to remember this comment once the manga ends.