A priceless relic known as the “King’s Seal” (Ouin) is stolen during its transport through the Soul Society. Toshiro Hitsugaya, captain of the 10th Division, is assigned to guard the seal, battles the group’s leader, and then goes missing. The Seireitei declares Hitsugaya a traitor and orders his capture and execution. Ichigo Kurosaki refuses to accept this verdict. Joined by Rangiku Matsumoto, Rukia Kuchiki, and Renji Abarai, he vows to uncover the real mastermind, rescue Hitsugaya, and clear his name. At the same time, a rogue Hitsugaya hunts the perpetrators and discovers a dark secret linked to a long‑dead shinigami.