BLEACH: The DiamondDust Rebellion - Mou Hitotsu no Hyourinmaru

A powerful item called the "King's Seal" is taken by an unknown group during its transport in Soul Society. Toshiro Hitsugaya, a captain in charge of moving it, battles the group's leader and then disappears. Seireitei accuses Hitsugaya of betrayal and demands his capture. Ichigo Kurosaki, doubting the accusation, joins Rangiku Matsumoto, Rukia Kuchiki, and Renji Abarai to find the true culprits and prove Hitsugaya's innocence. Meanwhile, Hitsugaya, now separated from his allies, investigates those responsible and discovers a hidden truth about a deceased shinigami.