Rumi Seto spends a lot of time worrying. What to eat, where to go, who to love. But one thing she is sure of she wants to spend her life writing music with her younger sister, Lea. Then Lea dies in a car accident, and Rumi is sent to live with her aunt in Hawaii. Now, miles from home, Rumi struggles to navigate the loss of her sister, feeling abandoned by her mother, and the aching absence of music. With the help of the “boys next door” teenage surfer Kai, who doesn’t take anything too seriously, and old George Watanabe, who succumbed to grief years ago Rumi seeks her way back to music, to write the song she and Lea never had the chance to finish.