Here u go:
Sea Foam (no romance, abt pain of war): https://www.mangago.me/read-manga/sea_foam/
1441108 (shoujo ai, heartbreaking SE, psychological): https://www.mangago.me/read-manga/141108/
Hana to Uso to Makoto (shoujo ai, tragedy): https://www.mangago.me/read-manga/hana_to_uso_to_makoto/
Tsuki no Uragawa (a super-short oneshot that broke my heart): https://www.mangago.me/read-manga/tsuki_no_uragawa/
Can ya'll rec me any type of sad story anythings fine as long as it is sad even if it's a bl/gl or have a happy ending I wanna give my heart internal pain for no reason ╮( ̄▽ ̄)╭
(yeah I've already read 10 yrs where I loved you the most (ㅍ_ㅍ))