The full title of this anime is Ano Hi Mita Hana no Namae o Bokutachi wa Mada Shiranai. (We Still Don`t Know the Name of the Flower We Saw That Day.) but for obvious reasons, it often goes by the short name of Ano Hana.
Except for Honma Meiko (nicknamed "Menma") being a ghost, the story deal with the real life issue of coming to terms with the loss of a family member or a friend. Or rather, the story shows the potentially debilitating problems of not completing the grieving process, for both adults and children.
Ano Hana is easily one of the best series I have seen in recent years and is now on my list when answering, "Why do you like anime?", or "What anime do you recommend?" Curiously, there is no scifi or fantasy anime on that list at the moment. ^_^