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Muramasa dead rogue Zanpakuto known as 'Beast Swords' continues to terrorize the Soul Society. To make things even more troublesome the recently deprogrammed Zanpakuto are still in their materialized forms. In order to figure out this new situation Captain Kurotshuchi requests that one of the Beast Swords be captured for analysis and the job falls to Rukia, Senbonzakura and Sode No Shirayuki.
Ichigo and Muramasa are trapped in the remnants of Kouga's inner world where they finish their fight. Although Ichigo quickly figures out the secret behind Muramasa's attacks he requires Zangetsu's help in order to defeat him. However, they are quickly running out of time to settle the score as the realm starts to crumble around them.
The Shinigami and their newly deprogrammed Zanpakuto arrive to join the fight against Muramasa. However, they first have to defeat the seemingly endless number of Menos that have also appeared. Things are further complicated by the squabbling between the Shinigami and their Zanpakuto and the animosity towards Byakuya.
While Byakuya finishes dealing with Kouga, Ichigo, Rukia, Orihime, Ishida and Sado are left to deal with Muramasa. However, now that he has transformed into a Hollow Muramasa is much more powerful and even with Byakuya's help they may not be able to stop him.
Byakuya reveals that his betrayal of the Shinigami was simply a ruse in order to discover Kouga's location. Although it seems that Byakuya has the upper hand over his Zanpakuto-less enemy, Kouga's unique ability soon evens the odds.
Having escaped from prison Kouga exacts his revenge on the Shinigami who betrayed him. However, that is not enough and he decides to exact his revenge on the entirity of Soul Society. Ginrei and Yamamoto must then work together in order to stop his rampage and seal him away.
Several hundred years before the last episode Kouga Kuchiki is caught in the midst of a Shinigami civil war. Kouga together with his zanpakutou Muramasa quickly makes a name for himself and soon becomes a problem for the leaders of the rebel faction. As such he is set up for a crime he did not commit and before Ginrei can clear his name he escapes with Muramasa's help and starts a rebellion of his own.
While Yamamoto, Kyouraku, Hitsugaya and Ukitake deal with Ryuujin Jakka, Kenpachi is finally enjoying his fight against Gonryoumaru and Yoruichi shows Haineko and Tobiume why she is known as the Goddess of Flash. Meanwhile, Senbonzakura and Rukia arrive to join the fight between Muramasa, Ishida, Sado and Orihime.
Now in possession of Ryuujin Jakka, Muramasa heads to Karakura Town to revive his former master Kouga. However, he is interrupted by Orihime, Ishida and Sado. Meanwhile, Ichigo and the others are trapped in Soul Society and it is up to Hyourinmaru and Hitsugaya to save them.
Whilst trying to rescue Captain-Commander Yamamoto Kyouraku faces off against Katen Kyoukotsu, Ukitake takes on Sougyo No Kotowari, Kenpachi fights against Gonryoumaru and Tengen and Yoruichi is left to deal with Haineko and Tobiume. However, it soon becomes clear that the Zanpakutou are simply trying to delay their opponents as long as possible. Meanwhile, Ichigo is once again forced to fight Muramasa.
Yoruichi has discovered where Captain-Commander Yamamoto is being held. As such Ichigo, Kenpachi, Ukitake and Kyouraku accompany her on a dangerous mission in to enemy territory to rescue him.
The arrival of Ashisogi Jizou cuts short both Kenpachi's and Ichigo's fights. Meanwhile, Soi Fon continues her battle with Suzumebachi and is forced to use Shunkou to counter her opponent's maneuverability.
Kenpachi finally arrives to join the fight after getting lost on his way back from Rukongai. He then proceeds to decimate the surrounding area so that he can fight the strongest opponent there, Byakuya. Meanwhile, Ayasegawa decides that it is time to go all out against Ruri'iro Kujaku.
Isane and Iba come face to face with Ashisogi Jizou, Tobiume and Haineko. It is then up to Hinamori and Matsumoto to help them out. Soi Fon continues her fight against Gonryoumaru and Tengen but things quickly become more complicated when Suzumebachi joins the fray. Ayasegawa is also having a hard time in his fight against Ruri'iro Kujaku. Meanwhile, Ichigo and Senbonzakura are both going all out to end their own fight.
