Mayuri Kurotsuchi vs. Sawatari

Mayuri Kurotsuchi vs. Sawatari is one of the battles between the Bount and Soul Society during the Bount Invasion of Soul Society. It is the battle between the Bount, Sawatari and the 12th Division Captain, Mayuri Kurotsuchi.

Prologue
Some time later, the Bount's invade Soul Society. Sawatari is among the Bount's who enter the portal to invade Soul Society. Sawatari is present when the group of criminals led by Tōba who were recruited by Kariya open the gates to Seireitei. Once the Bount's are inside, Kariya gives each Bount a task. While Yoshi and Mabashi make distractions, Koga and Sawatari are to eliminate the thirteen captains of the Gotei 13. Sawatari notices the ruckus that Mabashi and remarks that he is doing a good job. Sawatari then decides that he should begin moving as well in completing his task but is secretely being followed by 12th Division Captain Mayuri Kurotsuchi. As they each engage in their own battles, Sawatari feels the death of Mabashi from across the Seireitei. Sawatari remarks that the enemy must be pretty good to have taken care of Mabashi. He brushes off Mabashi's death and states that he knows he is being watched and asks the spy to reveal himself. Mayuri steps forward and informs Sawatari that he tried to copy the Bount by hiding his reiatsu. Sawatari laughs, and tells the Captain that although his reiatsu was masked, there was no way to conceal the captain's lust for blood. Mayuri then asks Sawatari where Maki Ichinose is. Sawatari says that he felt Ichinose's reiatsu disappear some time ago and thought that it was likely that one of the Shinigami finished him off. Mayuri says it is a shame, but now he will aim the revenge he wanted on Ichinose towards him instead. Sawatari delightfully tells him to bring it, informing him of his task to kill the 13 Captains.

Battle
Sawatari and Mayuri Kurotsuchi face-off, each confident that they can beat their opponent. Sawatari summons his doll, Baura and he warns his doll that their enemy, Mayuri is different from the weaklings they've been fighting, as their opponent is a captain of the Gotei 13. Mayuri remarks that the Bount are interesting and he informs Sawatari that the power that the Bount have can be sourced from Soul Society's ancient technology. He then states that it's a pity because one single mistake caused the experiments to become forbidden and the information on them being lost forever. Mayuri then asks Sawatari if he'll be willing to become one of his research experiments, but Sawatari denies and states that the goal of the Bount is to destroy Seireitei. Mayuri tells his opponent that he'll regret his decision and the two of them prepare to battle. Baura heads into a different dimension and Mayuri states that he read the reports about Sawatari from Rangiku Matsumoto knows all about Baura's ability. Knowing that Baura can only emerge from large flat surfaces, Mayuri activates his Shikai and goes on top of a rooftop to avoid attack. However, to his shock, Baura enters back into Mayuri's dimension through the air and Mayuri is barely able to dodge Baura's attack. Mayuri continues dodging Baura's attack and he eventually swings his Zanpakutō on the Doll's scales. However, the scales are too hard and no damage is done, which gives the Doll enough time to slam into Mayuri and causing the captain to crash into a wall. Baura then attacks Mayuri again and Mayuri ends up losing the entirety of his left arm.

Sawatari comes out and tells Mayuri that since coming to Soul Society. he and the other Bount have gained a large amount of power from the reishi and Baura's alternate dimensions are no longer restricted to just the surface of the earth. Sawatari then mocks Mayuri for being this weak, feeling that the captain is far weaker than what he would expect from a Gotei 13 captain. Mayuri brushes off the attack and injects himself with Hojiku-Zai "regenerative serum" to regenerate his lost arm, causing his arm to regenerate and Sawatari mockingly praises Mayuri that he has an interesting body. After telling his "test subject" to be quiet, he pulls part of his ear out and it forms his hidden kusarigama Mayuri then immediately swings the scythe towards his opponent, telling Sawatari that he will make it so he cannot talk anymore. However, Baura is able to block the attack and immediately launches himself at Mayuri. Mayuri quickly dodges and continues to dodge Baura, telling him that he will not fall for the same trick twice. Mayuri remarks to himself on how he should have brought Nemu to serve as a decoy as he would not have had to put in so much effort. Mayuri then notices that Baura always hides in an alternate dimension whenever going from one place to the next, always appears just when about to attack and that he eats anything around his target. This causes Mayuri to head into an open area and he yells for Baura to come on out. Mayuri then uses explosives and blows them up to cause smoke to appear around the area. The smoke allows Mayuri figure out where the Bount is hiding and he throws his scythe towards the Bount and successfully hook it to Baura. As he draws Baura in, Mayuri tells Sawatari that his Doll must eat anything in its way and that with all the debris in the area it was easy to figure out where it was hiding. Having caught Sawatari, Mayuri goes and stabs him in the arm despite Baura's scales. However, Baura throws Mayuri into a wall before the captain can do any more damage. Baura falls to the ground and Mayuri remarks that it seems like his cut was too shallow, but after coming so far he should be able to defeat his opponent quickly. Sawatari then counters by asking Mayuri if it will really go that smoothly. Sawatari suddenly uses the reishi in the air to heal himself, telling Mayuri that the Bount are invincible in world overflowing with reishi. Mayuri recognizes the technique as the same ability that the Quincy use to harness reishi. Sawatari tells Mayuri that it doesn't matter how many times he attacks him as he can always heal himself by absorbing reishi, but Sawatari's right arm suddenly becomes paralyzed. Mayuri uses this opportunity to kick the Bount onto the ground and pin Sawatari to the ground. He steps on and stabs his Zanpakutō into Sawatari's paralyzed arm. Mayuri explains that his Zanpakutō paralyzes anything it cuts by selectively disrupting the brain signals controlling the neural impulses for movement in the limbs, but unlike normal paralysis, Ashisogi Jizō does not affect pain receptors and nerve endings.

Baura attempts to help, but Mayuri threatens Baura to stay where he is. Mayuri then takes his Zanpakutō out of Sawatari, remarking with intrigue that Ashisogi Jizō will still work no matter how many times Sawatari heals himself. Mayuri decides to take the Bount back for research, but Sawatari calls upon his Doll and Baura suddenly spits out everything it has eaten onto Mayuri, allowing Sawatari and his Doll to escape. Mayuri remarks that it doesn't matter if he runs since his Zanpakutō's effect won't disappear. In the alternate dimension, Sawatari heals his injuries but realizes his arm is not healing completely as Ashisogi Jizō's effect has not gone away. Feeling he has been crippled, Sawatari begins to think that he has lost. This angers him, and he refuses to accept defeat by the first captain he has come across. He then orders Baura to counter attack. Sawatari goes out of the alternate dimension and waits for Mayuri to come towards him, but Mayuri has already arrived. Astonished at Mayuri's speed, Sawatari asks how it is possible that Mayuri knew where he was. Mayuri explains that he knew where he was because of the records from Sawatari's battle in the Human World. He states that since his reiatsu was able to be tracked from the Kidō Kakushitsuijaku, it's possible for him to track Sawatari as long as he has that reiatsu data. He adds on that Ichigo was able to track him down with the Mod Souls, which inspired Mayuri to create a sensor that could track him down. He states that their earlier battle allowed him to get the reiatsu data needed to complete the device and Mayuri informs the Bount that he was specifically tracking him down from the start, as his body has aged from all the souls that he had consumed and that he'd be perfect research material. Sawatari then realizes Mayuri had been tracking him from the beginning and Mayuri sadistically asks him if he really thought the two had met by accident.

Mayuri asks Sawatari to become his research subject again, telling him that he will learn much about the Bount from Sawatari and that it is pointless to try to escape since he can track Sawatari with his sesnor. Yet Sawatari begins laughing, telling Mayuri that it is he who has been forced into a corner and has his Doll fire off a Hadō #4 Byakurai spell that was absorbed earlier at Mayuri. Mayuri dodges the attack and Sawatari informs Mayuri that his Doll has absorbed the spirit power of every technique it has been hit by. Mayuri continues dodging the various Kidō blasts fired off from the Doll, but Baura chases after him with faster speed than before and it eventually bites into Mayuri's left arm. Mayuri stabs into the underbelly of the Doll, causing it to fall down. Mayuri is shown to have lost his entire left arm again as Baura lies the ground injured. Sawatari tells the captain that his lost left ar makes their pain even and states that he must finish off the captain before he heals himself again. He orders Baura to attack, to which Baura gives a weakened affirmation.

Angered at the how overly confident his “lowly experiment” are acting, he yells that he can no longer forgive the Bount and suddenly decides to release his Bankai. Across the Seireitei, many others sense this battle. Sawatari is surprised at the appearance of Mayuri's Bankai and Mayuri tells him that it breathes a poisonous derivative of Mayuri's blood and there is nowhere to hide. Konjiki Ashisogi Jizō then emits its poison fog and Sawatari quickly overcomes his surprise that the Bankai emits poison, calling on Baura to swallow up the poison. As Baura continues to swallow the poison, Sawatari decides to strengthen his Doll by giving all of his Reiryoku to Baura. Baura tells Sawatari that he will swallow everything and begins to grow larger and larger. Mayuri, in turn, increases his reiatsu and tells Sawatari to not get overconfident as he is going to die as he no longer will keep him alive as a research specimen. Sawatari tells Mayuri that he will not in a place like this since he had the broken the Bount's rule on not consuming living souls to gain power and become the leader of the Bount. Baura then jumps into the air and tries to devour Konjiki Ashisogi Jizō, biting its head. Mayuri then calls for his Bankai to use its hidden spikes which send Baura falling back. He sends his Bankai across the field as Baura falls down and it crashes into both Baura and Sawatari. As this happens, Uryū and Yoshi both sense the battle. Mayuri approaches Sawatari who calls for his doll, but he doesn't get a response. He then begins to die from the poison, having exhausted all of his Reiatsu. Realizing the end is near, Sawatari begs Mayuri for the antidote in exchange for information about the Bount, but Mayuri refuses, no longer having any interest. Sawatari tries to beg for help again but his body turns to dust before Mayuri. Mayuri, mildly surprised that the poison spread through Sawatari's body that fast, remarks that he just wasted his time and heads back.

Aftermath
Sawatari dies from being poisoned by Mayuri's Konjiki Ashisogi Jizō, having exhausted all of his Reiatsu. Mayuri Kurotsuchi loses his left arm after finding that he has used up all of his Hojiku-Zai in regenerating the damage from the early stages of the battle. He returns back to the Shinigami Research and Development Institute to restore his lost arm.