If you liked
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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...then you might like
Nagi no Asu kara
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Very similar feeling. Lot's of drama and hidden feelings among a group of friends, resulting in/because of an unfortunate event. Also, both series revolve around their "mascot": an airheaded young girl who would do anything for her friends.
If you liked
SKET Dance
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...then you might like
Yankee-kun to Megane-chan
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Similar high school setting about a group of misfits who become friends and create/join a group to help the school. Both are gag manga with some drama and seriousness in between.
If you liked
Kyoukai no Kanata
|
...then you might like
Noragami
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Both series are about a 'boundary' between two realms/worlds, where evil spirits are coming into the real world. Both have protagonists that have superhuman powers (Yato and Mirai) that are funny characters who are hiding an important issue, and both have a 'normal' friend (Hiyori and and Akihito) who try and lead them in the right direction, morally.