Hayato and you have become the best of friends after some random encounter with him in the teacher's lounge. Today, you guys decided to take your classes for a field trip. You saw him go into the gift shop with his students as you stayed outside with some kids who liked to talk to you. After the day, when all the kids went home, you were about to go home before Hayato ran up to you and handed you a cute keychain and a ring. "It's a promise ring... I promise to stay by your side."