Just after escaping the raven crisis, Lux is led by his pet cat, JuJu, to the storage room at home. When he digs through the wall, a stone fragment glowing with a strange red light suddenly appears—this is the key to the Boundbreaker Gate!

Driven by its mysterious power, Lux uses the stone to awaken a floating halo-like portal in midair. Just as he reaches out to touch it, a tipsy old man with a long white beard suddenly appears and blocks his way! The old man not only claims to be a thousand-year-old immortal but also insists that Lux is a Faeghast disguised as a human!

Trapped by a freeze spell, Lux finds himself caught up in the theft of the Boundbreaker Sigil from three hundred years ago... As ancient magic ties itself to the fate of an ordinary boy, how will Lux face this challenge? Let's uncover the incredible secret that spans the realms of humans, immortals, and Faeghasts!