When a mysterious group steals the prized 'King's Seal' during transit in the Soul Society, Toshiro Hitsugaya, the Gotei 13's 10th Division Captain, is entrusted with its safekeeping. Engaging in a fierce battle with the group's leader, Hitsugaya vanishes without a trace. In the aftermath, the Seireitei brands Hitsugaya a traitor, issuing orders for his capture and execution. Refusing to accept this verdict, Ichigo Kurosaki bands together with Rangiku Matsumoto, Rukia Kuchiki, and Renji Abarai to delve into the truth behind the stolen artifact, locate Hitsugaya, and exonerate him. Meanwhile, a renegade Hitsugaya embarks on a personal quest to unmask the culprits, leading him to a chilling revelation tied to a deceased shinigami of the past.