After murdering his brothers and fleeing the kingdom, the fugitive Prince Leo Elaion stirs up an uprising. Everyone believes that he will fulfill a long-standing prophecy: the last prince will become a beast that destroys the kingdom. With his sights now set on the king, Leo seems to be one step away from achieving ruin.

Meanwhile, Philia Rosé is a hotheaded nun, proclaimed as a worker of miracles thanks to her secret ability—she can delve into a person's heart and mind by meeting their gaze. But due to its uncontrollable growth, Philia has reverted herself back into the body of a child to hinder her talent's erratic nature. Her mission is to guide the prophecy and prevent the fall of the kingdom at all costs; as such, she is sent to Prince Leo's side, accompanied only by the knight Diati.

However, when Philia locks eyes with the prince, her mind is flooded by a torrent of emotions, falsehoods, and truths. Just what lies behind Prince Leo's ice-cold gaze, and what has driven him to the edge of madness?