Rainbow Song is a beautiful, yet tragic love story about a romance that never happened. Two young film students, Tomoya and Aoi, become fast friends after being put on a project together. Quickly, Tomoya becomes enamoured with the young girl but is too afraid to tell her his true feelings. After graduation, Tomoya continues living in Japan working on a film set and Aoi leaves to work in America. The movie takes a turn as Tomoya finds out that Aoi never made it to her destination because of a plane crash. He then starts to become consumed with his thoughts, day-dreaming about the love affair that never was nor can be
In order to stop his classmates from bullying him, the protagonist, Kamiya Tooru, makes a false confession to a girl in his class, Hino Maori. Even though she knows that the confession is a lie, Maori says yes with the three rules: "Don't talk to me until after school," "Keep communication brief," and "Don't fall in love with each other". The two promise not to fall in love, but as they get to know each other, they find themselves drawn to each other. When Tooru finally couldn't hold back his feelings, Maori's words were unexpected. "I have an anterograde amnesia, and I forget things when I sleep at night. Everything that's happened in a day". Her memories and experiences were reset every day, and she wrote down the day's events in a diary and woke up early in the morning to review them in order to keep her memory alive. Tooru is devoted to bringing her as much happiness as possible. However, such daily life did not last long. What is the "plan" that Tooru has devised to protect Maori's happiness? The raging climax and the fragile tenderness will wrap the world in warm tears once again.
Ryo is a former professional boxer who becomes a collector for a loan shark. He grew up in an orphanage in Okinawa Prefecture with heroine Haru, Natsumi, an aspiring actress, and two others. One of them is now a lawyer who has had to bail Ryo out and the other a lucky young woman adopted by a rich family. Haru, too, was adopted and has never once left the island where she grew up. When her adopted mother dies, she decides to go to Tokyo to find the old group. Being naive to the ways of the modern urban world, she almost ends up being sold off into the sex industry as soon as she sets foot on Tokyo's fair shores, but Ryo comes to her rescue
