AU: Yamato Kazakiri meets a girl named Amu in a Summer Festival, in that moment they fall in love. After, they start to have a relationship, they promise to each other that they would never be apart. But when the relationship turns a month, Yamato's dad decided to send his son to South Korea. That promise broke up and Yamato never said goodbye to Amu... His first love. Four years later everything has changed, but between Amu and Yamato will have a new destiny for meet again.