Classroom of Mysteries

International Magic Academy.
The paradise of many talents and a sure way towards fame and power. This is where our story begins...

One day, a girl got lost on her first day and a mysterious boy from the E-1 class helped her.

"What? E-1? There are only A, B, C, D. How can you be from the..."

The girl wanted to end her sentence, but the boy disappeared.

Who is this boy?

What is the meaning of "Loud silence"?