I typically avoid anything with tragedy, and try to read ones that are more upbeat. However, I've recently gotten into the mood of reading sad manga. Is there a series that made you actually tear up? I've read series that had put me in a somber mood, but I never actually cried over a manga.
The one closest to a tear jerker for me was Bokura ga ita.
Annarasumanara Watashitachi no Shiawase na Jikan Koe no Katachi Hoshi No Koe (This didn't make me cry but it has a melancholy mood)
________________ "They are not brave, the days when we are twenty-one. They are full of little cowardices, little fears without foundation, and one is so easily bruised, so swiftly wounded, one falls to the first barbed word. To-day, wrapped in the complacent armour of approaching middle age, the infinitesimal pricks of day by day brush one but lightly and are soon forgotten, but then--how a careless word would linger, becoming a fiery stigma, and how a look, a glance over a shoulder, branded themselves as things eternal." Daphne Du Maurier