 If you liked
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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 ...then you might like
Sora yori mo Tooi Basho
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Both are slice of life shows with well developed, realistic characters, and both involve friendship helping to deal with the loss of a loved one.
Both chill animes that focus on a group of friends. Something you can relax and just watch without worrying about getting sad