Ame to yume no ato ni (2005)

Ame Sakurai is in junior high and lives with her father, who is a butterfly collector in search of the Troides Magellunus. One fateful day, he decided to take a trip to Taiwan in hopes of catching the elusive specimen. Unfortunately, something goes wrong and Ame is left with only memories of Father. Memories that seem to have allowed him to return as a spirit guide for Ame.