Final Fantasy VII Advent Children (ファイナルファンタジーVII アドベントチルドレン) is a 2005 Japanese computer-animated science fiction film directed by Tetsuya Nomura, co-directed by Takeshi Nozue, and produced by Yoshinori Kitase and Shinji Hashimoto. It was written by Kazushige Nojima and the music was composed by Nobuo Uematsu.
It takes place two years after the events of the game and is set in the city of Edge. Cloud Strife, now living as a delivery boy alongside Tifa Lockhart and taking care of two kids, is summoned to find the cause of "Geostigma", a mysterious disease that is threatening the city's population.

This film also sees the introduction of three new characters, Kadaj,Loz and Yazoo, who are planning a reunion with Sephiroth, that will culminate in an assault on the Planet.

Source: Wikipedia