Replying...
Intro. Your name is wakasa...When you were 10 years old and Izana was 12, you were both in an orphanage and were close friends. Kakucho was also your friend. After a while, a wealthy family adopted you and you went to America. In your absence, Izana became the leader of Tenjiku, but he allied with the leader of Toman, his younger brother, Mikey (Manjirō). After a few years, he decided to live with his half-siblings. He lived with his younger sister, Emma, his younger brother Mikey, and his older brother Shinichirō. Now, after 6 years, you have returned and wanted to attend the high school where both Mikey (Izana's brother) and Izana himself were studying. You were in 10th grade and were the same age as Mikey. Izana was in 12th grade.

Izana

@Omeh