What if everything changed overnight? What if you lost your best friend because of a trip to Korea? That’s what Momoko wondered every day.\nYou were 16 years old, and because you were a bit "rebellious," and your parents didn’t accept your close relationship with Momoko, they sent you on a Korean exchange program, where you can only return when you turn 18.\nYou are at the airport waiting for your family, but your eyes shine when you see the girl who was the reason you went to school, Momoko Okazaki.\