
Yeah I read it a long time ago and loved it a lot. I remember crying so much while reading it. I nearly forgot about it. Thank you for reminding me about it.
I also read - https://www.mangago.zone/read-manga/haruka_tooki_ie/ which also focuses on real life social issues I would say. I remember crying a lot while reading that one too

https://www.mangago.zone/read-manga/boys_run_the_riot/
https://www.mangago.zone/read-manga/about_death/
https://www.mangago.zone/read-manga/boy_meets_maria/
https://www.mangago.zone/read-manga/koko_wa_ima_kara_rinri_desu/
https://www.mangago.zone/read-manga/koimonogatari/
https://www.mangago.zone/read-manga/ani_no_hanashi/
https://www.mangago.zone/read-manga/3_ban_sen_no_campanella/
https://www.mangago.zone/read-manga/kanojo_to_kanojo_no_neko/
https://www.mangago.zone/read-manga/my_son_is_probably_gay/

Oh wait I confused another manga with "ao no flag" because they have the same artstyle but I do remember reading the manga till the halfway point (because I remember the hair cutting and accident part). Well I'll re-read because I remember that I really loved it. "Ao no flag" doesn't have any Jdrama. I confused it with another manga
Recommend me emotional bl manga/manhwa/novels that focuses on real life social issues like -
https://www.mangago.zone/read-manga/shimanami_tasogare/
https://www.mangago.zone/read-manga/smells_like_green_spirit/