"Zaher" transmigrates into a Western fantasy novel. To avoid getting entangled with "Fallen," the future Demon King who will destroy the world, he trains hard and plans to escape to a safe place. However, at the academy entrance exam, zaher encounters fallen before his awakening—and they even become roommates! Before he knows it, they’re not just sharing a room but also a bed... Their relationship teeters on the edge of friendship and something more. "Will my friend become the Demon King?"