https://www.mangago.me/read-manga/dareka_yume_dato_ittekure/
https://www.mangago.me/read-manga/terano_kun_to_kumazaki_kun/
https://www.mangago.me/read-manga/wolf_me_up/
https://www.mangago.me/read-manga/kimi_no_tabegoro/
https://www.mangago.me/read-manga/back_to_school/
As I am not sure if it suits your taste, it is a mix of genres but they're in highschool (/TДT)/
Here only got straight so far, enjoy!
School Life Pt 1
https://www.mangago.me/home/mangalist/1408350/
School Life Pt 2
https://www.mangago.me/home/mangalist/1759860/
https://www.mangago.me/read-manga/kimi_ni_wa_todokanai/
Just remembered this one it has a live action anime adaptation but the manga is an adorable and charming slow burn.
looking for highschool romance!!! straight, gl, or bl wtv