In a quiet village hidden at the edge of a mist-covered forest, 16-year-old Kaito discovers an ancient katana buried beneath the roots of a sacred tree. The blade, known as Kagekiri (Shadow-cutter), is whispered about in local legends—a weapon forged to seal away a forgotten evil.
From the moment Kaito grips the hilt, he feels a bond with the weapon. However, with this bond comes a curse: Kagekiri speaks to him in whispers, revealing the existence of shadowy creatures lurking just beyond the village, beings only he can see. The blade grants him unparalleled speed and reflexes, but it demands one thing in return: he must uncover and confront the truth of his family's mysterious past.
When his village is attacked by a creature known as a Shadeborn, Kaito must decide if he's ready to take up the mantle of protector. As he delves deeper into the forest, he discovers that the blade's true purpose is not just to destroy the shadows—it holds the key to a labyrinth of forgotten realms, where danger and destiny intertwine.
Kaito's journey will lead him to ancient mazes, ethereal guardians, and a revelation about the nature of light and shadow, all while the katana's whispers grow louder, blurring the line between ally and foe.