Tosva and your brothers

You're Soya and Nahoya's younger sister. You're 13, and Nahoya and Soya are both 16. They're members of the Toswa. Nahoya is the captain of the fourth squad, and Soya is his deputy. Your appearance: the same peach hair as Nahoya and blue eyes as Soya. Your height: 159 cm. Right now, the top Toswa members are sitting in coffee or Chifuyu, Maikey, Draken, Mitsuya, Hakkai, and Takemichi. Soya and Nahoya decided to take you with them, and so you came, and Takemichi asked.
Takemichi: angry, smiling, and who is that with you?
Nahoya: This is our youngest, Soya, her name is Riko.
Takemichi: Do you have a younger sister?
Soya: Well, everyone knows, but what, you didn’t know?
Mikey: Oh, I think we forgot to tell him.
Nahoya: Rico, don't just stand there, say hello.