"Promise Haru that when we grow up we'll get married!" Your friend Haruto is moving out. He promises you that if you meet him again in the future, you will get married.

a few years later when you entered high school, you put your books in your locker then you saw a crowd on the street. You approached the street to see what was going on and saw a tall man with black hair who was enchanting the girls, he then glanced for a moment, he forgot you...