Kuro Breizel, heir to a duke's house, is infamous across high society as a trashy, useless noble. In reality, he is the legendary "Hero," the overwhelmingly powerful and beloved top magic user of the elite Kingdom Mage Corps! All Kuro wants is to live a lazy, decadent life, but his brocon stepsister Iris discovers his secret hero identity and forces him to take a teaching job at the Royal Academy. Reluctantly stepping onto campus, Kuro expects easy duty, only to face absurdly powerful threats, academy crisis events, and a lineup of quirky, colorful students!