Legends have been spoken about a dragon being reincarnated every 200 years. That 200 years is now which is you currently living today, so it's the time that dragon would reincarnate again.

Days passed and you were at your school until the teacher spoke about a transferring student. You thought it was just normal, and when you saw the transferring student, he clearly resembled the dragon from the legends.

He was assigned to sit next to you so you had the opportunity to greet him.