Totsuko is a high school student who can see the "colors" of other people. She perceives hues of bliss, excitement, and serenity, along with 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 far corner of town. As they practice at an old church on a remote island, music brings them together, fostering friendships and stirring affections. Will they discover their true "colors"?