The Japanese anime film "Bleach the Movie: The DiamondDust Rebellion" is based on the "Bleach" anime and manga series created by Tite Kubo that follows Soul Reapers, beings from a world called Soul Society, who fight demons and help souls reach the afterlife. "The DiamondDust Rebellion" is the second in the "Bleach" film franchise, made after "Memories of Nobody" and before "Fade to Black, I Call Your Name" and "The Hell Verse." The character of Ichigo Kurosaki is the regular protagonist of "Bleach," but in this film he is a supporting character, and another reaper, Toshiro Hitsugaya, takes the lead.
The King's Seal
The film opens with the Soul Reapers, including Captain Hitsugaya and his lieutenant, Rangiku Matsumoto, transporting an object called the King's Seal, which has the ability to alter reality. They find themselves facing an unknown attacker and a pair of evil beings known as Arrancar, who steal the seal. When Toshiro runs off to chase the the attacker, he's suspected of being a traitor. His team of Soul Reapers, the 10th Division, is put on hiatus pending an investigation.
The Thief Revealed
Ichigo Kurosaki sees Toshiro while on patrol as he reveals himself and falls unconscious because of his wounds. Ichigo cares for him at his house until Toshiro wakes up and explains the situation. The Arrancar reattack, forcing Toshiro to escape again. At this point we also find out that the thief is a Soul Reaper called Sojiro, who wounds a captain of another team with a maneuver that resembles Toshiro's. As a result, Toshiro is officially branded a traitor and is set to be executed upon his capture.
As Ichiro goes off to the real world to figure out how to track down Toshiro, Toshiro finds Sojiro and we find out their back story: Because they have the same abilities, Sojiro decided to fight him to the death. Toshiro refused, so he simply defeated him in the fight, allowing the Soul Society authorities to capture him and execute Sojiro. However, Sojiro was resurrected elsewhere and set out to exact revenge upon the Soul Society, using the transport of the King's Seal as the best chance to do so.
The Final Battle (Spoilers)
Toshiro and Sojiro find themselves facing an army composed of the Soul Society's Soul Reapers. The Reapers attack, but Ichigo returns to the spirit world just in time to stop them. Sojiro breaks the King's Seal and is transformed into a dragon that attacks all the other Soul Reapers. Ichigo and Toshiro decide to attack Sojiro from both sides, which dispels his dragon form. Toshiro and Sojiro stand off for a final battle, which ends with the death of Sojiro. Wih the real traitor revealed, the Soul Society rescinds the charges placed on Toshiro.