Totsuko is a high school student with the ability to see the 'colours' of others.
Colours of bliss, excitement, and serenity, plus a colour she treasures as her favourite.
Kimi, a classmate at her school, gives off the most beautiful colour of all.
Although she doesn’t play an instrument, Totsuko 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 practise at an old church on a remote island, music brings them together, forming friendships and stirring affections.
Will they discover their true 'colours'?