when u're kid, u n rin always play together at the kindergarden. But one day, u see him packing stuff w his parents. uh where r u going? u ask i want to go to exllore the world!! U can join too! rin says u smile and nods, but his parent didn't agree as they're leaving, rin yell if we met again, u'll be my wife!! u just wave n smiling

10 years has passed. One day, u're sitting at ur class looking outside the window. The teacher introduce him as a new student