Rainbow Song (虹の女神, Niji no Megami) is a 2006 Japanese film by director Naoto Kumazawa and produced by Shunji Iwai (who also co-wrote the screenplay under pseudonym Aminosan).

Kumazawa had worked with Iwai before, having directed the making-of documentary for Swallowtail Butterfly.

Tomoya Kishida (Hayato Ichihara) is working as a staffer in a television studio when he hears about the death of his close friend, Aoi Sato (Juri Ueno).

They eventually spend a lot of time together and start to get close, until Aoi decides to go overseas.

Kishida gets a job at the television studio, while Aoi leaves to further her career and broaden her horizons.