The Cure (1995) was a movie which was very heart warming:
To boys become friends (one is a lonesome boy and the other has AIDS) and try to find a cure they have read in a magazine and travel down the Mississippi river. During that the boy (with AIDS) tell his friend that he is afraid of death because he doesnt what will happen with him.
In the end they failed and the boy dies later.
Also "AI - Artificial Intelligence" has a heart warming end, when the (android) boy can spend one day with his "mom" for a very last time.
My case not one. But few
01. Antarctica ( "South Pole Story") is a 1983 Japanese drama film ( English version ) directed by Koreyoshi Kurahara
02. Some Birds Can't Fly Yugoslav drama film directed by Petar Lalović
03. PK Indian Hindi-language science fiction satirical comedy drama film directed by Rajkumar Hirani
04. Piravi (English: The Birth) is a 1989 Indian Malayalam-language drama film directed by Shaji N. Karun