Kallen Kaslana, the enigmatic Divine Guardian, emerges from the shadows of her complex past with an unwavering sense of duty. A former Schicksal Valkyrie, she transitioned into the elusive Phantom Thief, Sixth Serenade, embodying rebellion against the corruption within Schicksal. Her character unfolds in a tapestry of sacrifice, love, and resilience, sealing her beloved, confronting betrayal, and meeting an untimely demise.