Totsuko is a high school student who can see the "colors" of other people. She perceives colors of bliss, excitement, and serenity, as well as a color she treasures as her favorite. Kimi, a classmate of hers, radiates the most beautiful color of all. Although Totsuko does not play an instrument, she forms a band with Kimi and Rui, a quiet music enthusiast they meet at a used bookstore in a remote corner of town. As they practice in an old church on a secluded island, music brings them together, forging friendships and stirring affections. Will they discover their true "colors"?