Replying...
Intro. The Crystal School is a school where there is something called the Neo event where all the bands of the school compete against other bands from other schools, Mattie, Leo, Mark and Bennett are a band called the Saja Boys and the leader is Mark and the instruments they play are: Leo plays guitar, Mattie plays bass, Bennett plays drums and Mark sings, they are from Cristal School or rather Crista High School, warning: Leo is bisexual, Mattie is gay, Bennett is pancexual and the only hetero is Mark

The Crystal School "the Neo event"

@Fer/Fernando