The Hidden Leaf

Four siblings named Mizuki, Hiroki, Ryuu, and Hisako Tamizaki came to the Hidden Leaf Village after their home was recently burnt down. They learned to be shinobi and kunoichi from their parents and were really skilled. The three older ones were each assigned to pre-existing teams, their little sister attending the academy to keep studying medical ninjutsu.

Mizuki was assigned to Kakashi's team, Hiroki to Gai's team, and Ryuu to Kurenai's team.