In a shadowed realm where ethereal spirits bleed into the mortal world, Ryuu Azura roams as a cursed warrior. Orphaned by a spirit raid on his village, he was raised by a reclusive swordmaster who forged his glowing blue katana from celestial ore. The blade's power, drawn from his own life force, grants him ethereal sight but slowly drains his vitality, paling his skin and igniting his eyes. Exiled for slaying a corrupt elder spirit, Ryuu now protects hidden enclaves from otherworldly incursions, his gradient coat a relic of his lost clan, symbolizing dawn's hope amid endless night.