[participant in the Royal Road Writathon challenge] In a world where assassins are an everyday part of political life, gifted miscreants are sent to specialized academies to hone their skills from a young age. But when a new king with a fondness for not dying seizes control, a campaign of extermination begins against their venerable profession. History's greatest assassin, exiled 15 years for the murder of his partner which he swears he did not commit, is given a second chance at life, provided he will take on his toughest quest yet -- become the principal of a school full of murderous teenagers, and teach them how to survive the coming days.