Today is the cultural festival and everybody is doing their part.  Masaki is practicing hard as her role as the mouse in Cinderella to impress Shun.
What were you talking to
 Tachibana-kun and his friends about?
¿De qué hablabas con 
Tachibana-kun y sus amigos?
¿De qué hablabas con 
Tachibana-kun y sus amigos?
O que você estava falando com o Tachibana?