Any recommendations?

Sea foam
Rental onii chan
Nageku shinigami
World's end garden
Go to the manga directory and select one shot and tragedy (or whatever you like) and then filter it to popular. All the good ones come)

if you're looking for something warm and fluffy, I love this one:

http://www.mangago.me/read-manga/futari_hyakkei_kaze_no_owari_haru_no_hajimari/

Thank you ヾ(☆▽☆)