High school turns out to be much the same as junior high, with veiled threats and weird teachers.

Book 4 Chapter 7 - Abuse of Authority

Living in secret and stealing to eat is a hard life, but it's all Kuro has ever known. Fear and necessity forged him into the finest young thief in the wizard kingdoms. Nobody can hide forever, though, and a run of poor luck lands Kuro in a place where his quick hands and quiet feet count for nothing: Avalon Academy, school of magic.