Stories that take place in school? (like where they make school friends, etc!! i love fo...

Kamisama No Iutoori, Bokutachi ga Yarimashita and oyasumi punpun..
just kidding. Anyway.
"19 days" (there is romance, but friendship is top tier like really)
"Toilet-bound hanako-kun"
"slam dunk" ( u can mostly browse through sports manga, good development of relationships yk)
can't forget komi-san can't communicate

also. not really a manga? but you can check out the bandori/ bang dream! franchise. school girls forming bands, very nice fr

https://www.mangago.zone/read-manga/skip_to_loafer/

https://www.mangago.zone/read-manga/skip_to_loafer/

https://www.mangago.zone/read-manga/swim_classes_for_a_mermaid/

https://www.mangago.zone/read-manga/my_introverted_boy/

https://www.mangago.zone/read-manga/spirit_fingers/