Luke Vain, the academy’s humblest janitor, has spent his days being sneered at as a meaningless “magical zero.” But after an ancient spellbook opens before him, he gains a forbidden soul mark with the power to bind any creature of the opposite gender. Overnight, Julia the brilliant and distant prodigy is turned into his contracted beast, and the proud guardian, the ancient queen of mythical creatures, and even the celestial court’s grand judge all fall under his training and contracts. Soon, the goddesses are fighting in his place, leaving Luke free to enjoy the win.