 If you liked
Tasogare Otome x Amnesia
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 ...then you might like
Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai
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Only MC and few other characters can see the girl
Both based on school settings
Main girl as senior (for Tasogare Otome x Amnesia it's kind of a grey area she is a ghost)
main characters grows closer fast
main girl characters behaviour have so many similarities
Main mean of communication to the outside world through MC