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a really devastating dissection of grief: https://www.mangago.zone/read-manga/happy_birthday_1/
havent read this but ive had it recd so lol: https://www.mangago.zone/read-manga/back_in_time_to_you/
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Haruka Tooki Ie and Spring Snow got me really bad.
Here's my cry baby list.
https://www.mangago.zone/home/mangalist/2628518/?filter=&page=1
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https://www.mangago.zone/read-manga/incidentally_living_together/ I cried and cried so hard till I couldn't breathe
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"Into the Rose Garden"
This one just shattered my heart and i'm still waiting for the next chapter to cry more while still hoping for a happy ending
Note that it's an omegaverse, also violence/rape/angst themes.
https://www.mangago.zone/read-manga/into_the_rose_garden/
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https://www.mangago.zone/read-manga/hanbun_ageru/ this had me sobbing crying
please recommand me the most heartbreaking yaoi you ever read, i wanna cry until there isn't any teardrops left on my eyes