“I got my heart broken for the first time,” laments Yuna Ito, ‘‘at the unbelievable age of 24!” Hearing her vibrant new single, “Koi wa Groovy2”, it would be hard to guess that such an experience would be the inspiration. “It’s about getting ready to love again,” she remarks warmly. Ito moved to Japan five years ago from Hawaii, where she was brought up by her Japanese father and Korean-American mother. Now 25, she has always worn her heart on her sleeve.