Guitarist Kai's father passed away when Kai was young, leaving his mother and younger brother--until his mother remarried recently. Now Kai and his brother have been living together with their stepfather and new stepsister, Miyu, for about a year. It's the kind of happiness Kai has wanted for his family ever since he was a child and he certainly can't rock the boat. That's why it's absolutely imperative that no one find out he is in love with Miyu. Still, he can't help but express the pain if a love that will never be in his compositions....