I never cried that much for a manga, and I still don't know how the author make me attach that fast with the characters, like you even know it and boom something bad happen to them and you are literally a lake of tears, I don wanna spoil but damm it the end make cry more and give me mix feeling like yes they are happy with the peaceful life that they deserve and makes cry more but they even remember each other and break my heart :'(
Kimetsu no Yaiba