I would love to reccomend https://www.mangago.zone/read-manga/10th_you_and_i_fell_in_love_with_the_same_person/
It got the same vibe as ao no flag and discuss about sexuality and human relationships.
https://www.mangago.zone/read-manga/life_senjou_no_bokura/
Very popular, i think you might have already read it
https://www.mangago.zone/read-manga/walk_on_water/
One of very few story where the smut is actually important af and author take on problem is just *chef kiss* also very popular
https://www.mangago.zone/read-manga/spring_snow_odongtong/
Short yet beautiful of how simple happiness can be
*angst* https://www.mangago.zone/read-manga/hana_no_miyako_de/ right feeling but the wrong time
https://www.mangago.zone/read-manga/asagao_wa_yoru_kara_saku/ again another angst of right feeling but wrong time
AAAA also this
https://www.mangago.zone/read-manga/tamayura_yuki_ringo/mf/v01/c001/
I love this manga so much
thank you for the recs!! I wholeheartedly recommend Faded First Love ( https://www.mangago.zone/read-manga/faded_first_love/) which you’ll love if you liked the wacky love triangle situation in blue flag!! except there’s no deep themes or angst, it’s just really cute
I love how they added the afterword after a year ahah, but seeing the notification from a manga i read a long time ago (and my fourth fav manga) was fdfgf. I really miss this manga :((