 If you liked
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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 ...then you might like
Kamisama no Inai Nichiyoubi
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For both Anohana and Kamisama no Inai Nichiyoubi, they both involve the concept of death and its aftermath. Thus, expect some supernatural themes.
The main female character from both series are kind and is selfless in helping others. Although the settings are a bit different, they give off a similar feeling of mystery. For Anohana, involves the main girl (Menma). For Kamisama no Inai Nichiyoubi, it involves the origins of its world setting.