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https://www.mangago.zone/read-manga/a_shoulder_to_cry_on/ (idk if this isnt mainstream cuz it has a drama adaptation but if you havent checked it out, please do!)
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https://www.mangago.zone/read-manga/kaze_no_iro_made_oboeteru/ (THIS IS SO PEAK)
https://www.mangago.zone/read-manga/koi_no_yuurei/
https://www.mangago.zone/read-manga/boku_no_kawaii_stalker/
https://www.mangago.zone/read-manga/kaze_no_iro_made_oboeteru/
https://www.mangago.zone/read-manga/fukutsu_no_zono/
https://www.mangago.zone/read-manga/sun_kissed_heartbeats/
https://www.mangago.zone/read-manga/fake_slackers/
https://www.mangago.zone/read-manga/bokura_no_tsuzuki/
https://www.mangago.zone/read-manga/unluckily_lucky/
https://www.mangago.zone/read-manga/every_day_i_want_to_be_number_1/
https://www.mangago.zone/read-manga/blue_sky_complex/
https://www.mangago.zone/read-manga/kisses_x_kiss_x_kisses/
https://www.mangago.zone/read-manga/don_t_leave_after_school/
https://www.mangago.zone/read-manga/the_edge_of_memory/
https://www.mangago.zone/read-manga/timing_1/
https://www.mangago.zone/read-manga/one_small_step/
Please rec high school bl that are not mainstream x