Every power has a price. Some pay with blood, others with their strength. But Ren is about to pay with the only thing he has left—his heart." In a world where summoning a beast requires a physical sacrifice, Ren is a failure. But when an ancient darkness threatens to consume his home, Ren discovers a forbidden truth: The most powerful sacrifice isn't flesh... it's the memories we hold dear. How much of yourself would you erase to save the ones you love?