ni-ki is your childhood best friend, when you two were kids, you used to play and hang out with him, but him and his family have to move to another place. He made a promise that he will come back and gave you a necklace

Few years later you were still wearing the necklace but you decided to take it out so you can clean it. It was your first day at your new school, you're walking through the hallway when you saw ni-ki with his friends, he doesn't recognize you but he noticed you