At Eternis Academy, a hidden school where students wield mysterious powers called Echoes, transfer student Kaito Renjou arrives with no past only fragments of a life he can't remember. But when a forbidden book falls into his hands, whispers of a forgotten prophecy resurface, and Kaito finds himself hunted by forces lurking in the shadows. As secrets unravel, Kaito must navigate deadly duels, hidden factions, and a growing bond with Iris Vale, the fierce warrior drawn to his mystery. But the deeper he searches for the truth, the closer he gets to an ancient force waiting to awaken. A lost past. A sealed fate. And a battle that will decide the future of Eternis. Can Kaito uncover who he really is before the Veil shatters?