 If you liked
Koko ni Iru yo!
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 ...then you might like
Aoi-kun ni wa Kanawanai
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No Match for Aoi-kun and I Am Here are two manga aimed at girls (Aoi-kun is josei while I Am Here is shoujo) with a main character who is a bit shy about their interests and just kinda keeps to themselves at school. However, after a surprise encounter, the main character starts to get friends and slowly realizes over time how they've begun to open up to others. The art is also just as wholesome as the story for both manga.