Anohana the Movie: The Flower We Saw That Day (Ano hi mita hana no namae wo bokutachi wa mada shiran

A group of friends were together forever until one of them died and they all went there separate ways. One day the leader of the group was able to see the girl that died and what has to do is grant her, her wish so she can rest in peace but this means that he must regroup all of his childhood firends