Byakuya Kuchiki vs. Shūkurō Tsukishima

Byakuya Kuchiki vs. Shūkurō Tsukishima is a fight that takes place during the Tale of the Lost Agent between the 6th Division Captain Byakuya Kuchiki and Fullbringer Shūkurō Tsukishima.

Prologue
After Kūgo Ginjō gives the members of Xcution some of Ichigo's power, Tsukishima approaches him and asks if he is going to give Shishigawara any of that power, saying leaving friends out is bad. Kūgo says that Shishigawara's ability would be a pain for them if it were strengthened and tells Tsukishima to kill him when the fight is over. Tsukishima sighs and says he found it to be an interesting ability. He later enters a chat room, prepared to face Byakuya Kuchiki in battle.

Battle
In the chat room, Tsukishima asks if Byakuya really has time to be staring at the moon. Byakuya turns around and tells him that it is fortunate that he is his opponent. Byakuya says that Ichigo is too lenient and would not be able to bear his blade for the sole purpose of striking Tsukishima down. Kenpachi is even less suited as his only wish is the thrill of battle and that is not suited for Tsukishima's ability. Tsukishima responds that Byakuya is acting as if he will not be cut and goes to strike Byakuya. Byakuya blocks with Senbonzakura without turning around and tells him that taking away the bonds of camaraderie is the height of cowardice. He says that it is a lack of shame that is deserving of being struck down. Tsukishima says he is there and tells him to strike him down. Byakuya tells Tsukishima he is there to kill him and he sends his Shikai at Tsukishima.

Knowing that Byakuya's Shikai makes it difficult to get close to him, Tsukishima begins thinking of how to handle him. He then begins striking the ground. In the middle of their battle Byakuya steps on a trigger in the floor, causing a large wall to emerge before collapsing on Byakuya, who manages to dodge it. Byakuya launches his Shikai again, prompting Tsukishima to strike the attack away. Byakuya asked when Tsukishima set up that trap, to which he responds long ago. Tsukishima then reveals that his Fullbring can effect any target, even inanimate ones. He appears behind Byakuya. Byakuya strikes at Tsukishima, but he easily catches his sword arm. Revealing that his Fullbring also cut through Byakuya's Shikai, he now has altered its past so for Tsukishima, Byakuya's attacks are fully known and boring to him.

Tsukishima lands a direct blow, slashing Byakuya across the chest. He retaliates with a strike of his, only for Tsukishima to easily dodge. Tsukishima reveals that he is fully aware of Byakuya's "Sheltered Area", knowing that the best tactic against his Shikai and Bankai is to get in at least 85 cm of Byakuya's person to avoid damage. He goes on to tell Byakuya that any technique Byakuya now uses is useless because Tsukishima "helped Byakuya develop them". Amazed that Tsukishima has learned so much about his abilities, Byakuya surmises that even his Bankai attacks will have no effect on Tsukishima, which the Fullbringer plainly agrees on.

Byakuya proceeds to reseal Senbonzakura to remove the "Hurtless Area", but Tsukishima then shows the immense cutting power of his Fullbring, slicing Byakuya's blade cleanly in half. While Tsukishima mocks Byakuya, he calmly picks up the severed blade and drops it with his sword, activating his Bankai. Tsukishima is indifferent, still saying it is boring, but surprised by Byakuya taking the risk of allowing his blades to enter the area. While Tsukishima applauds Byakuya's ingenuity and improved speed with his Bankai, he exploits the Bankai's speed by moving close enough to let the blades strike Byakuya's arm, greatly injuring it. Byakuya then raises his injured arm. While Tsukishima believes it to a desperate attempt to use Kidō, Byakuya strikes fast, impaling Tsukishima through his chest with a multitude of tiny blades. Tsukishima looks one totally horrified at the fact that he had been tricked. It is then revealed that Byakuya intentionally let his arm be struck so he could discreetly grab some of his blades to launch at Tsukishima. Tsukishima admits to being surprised by Byakuya's new tactic before collapsing.

Aftermath
As the gravely wounded Tsukishima lies on the ground with his eyes closed, he continues to feed the effect that his Fullbring has on Byakuya. He "reminds" Byakuya of his debts, questioning if he is pained after leaving the Fullbringer to die. While Byakuya admits to this as well as his gratitude, he also notes that Tsukishima is an enemy of Ichigo Kurosaki and states to have no qualms striking down Tsukishima on that reasoning. In response, Tsukishima opens his eyes and clenches one of his fists.