By the time Mai Nakahara’s family leaves Tokyo to help run her aunt and uncle’s restaurant in Hawaii, she’s pretty much gotten used to living without the arm she lost to cancer. But life in Honolulu presents its own challenges: a giant ocean she’s too afraid to swim in, mean girls to ignore, and sports to awkwardly avoid in gym class. Fortunately, there are also some good things about her new home, and with the help of her cousin, her new friends, and a famous one-armed surfer named Chloe Hayes, Mai discovers that the only real obstacle to her own happiness is believing in herself.