Ichigo Kurosaki vs. Shūsuke Amagai

is a battle that takes place in Seireitei and is the final event of the Kasumiōji Conspiracy.

Prologue
After killing Gyōkaku Kumoi and taking Rurichiyo Kasumiōji captive, Shūsuke Amagai disappears with the the captive princess. Rukia Kuchiki informs Ichigo Kurosaki that she has never seen a spell like Amagai just used and Ichigo becomes angry, fearing for Rurichiyo. At the First Division Barracks, Amagai confronts Genryūsai Shigekuni Yamamoto. Yamamoto asks what Amagai wants and why he has Rurichiyo. When Yamamoto expresses that he does not know the answer to his question, Amagai questions if Yamamoto never thought there might be people who would murder him if they had the chance. Yamamoto questions why he would want to murder him and Amagai responds by simply saying Shin'etsu Kisaragi. He has come in his name to kill Yamamoto. Amagai grabs his Zanpakutō but is interrupted by Ryūsei Kenzaki who uses his Benishidare to create a blinding mist in the air before attacking Amagai and having Rurichiyo escape. As Amagai tries to counter, Rusaburō Enkōgawa releases his Zanpakutō and covers Amagai in the tatami. Kenryū and Enryū rush to Rurichiyo to help her but Amagai soon breaks out.

Amagai goes to Yamamoto's desk and grabs the nucleus from Makoto Kibune's Bakkōtō. Feeding it to his own, the bakkutō's true form is revealed to be a black dragon shaped arm covering with many nuclei and a green glowing beam coming out of it. Yamamoto removes his haori and releases his Zanpakutō in retaliation. The flames spread wildly, destroying a portion of the room. Yamamoto sends flames towards Amagai but the traitorous captain stabs into them with his Bakkōtō, nullifying them to Yamamoto's surprise. Yamamoto questions how he did that and Amagai says that his Bakkōtō's power is to negate the powers of a Shinigami's Zanpakutō. Amagai then releases his Bankai and attacks Yamamoto, destroying much of the barracks and bringing the fight outside. When Amagai begins to threaten Rurichiyo, Yamamoto intervenes, saying he is the target. Amagai however says that he plans on taking the successor of the Kasumiōji Clan down with Yamamoto. He prepares to attack again but it interrupted by the arrival of Ichigo who slashes at Amagai.

Battle
Amagai blocks and Ichigo moves back as Rukia arrives as well. Amagai asks how they found him and Rukia says that Kenryū told them via a Jigokuchō. Ichigo then asks Yamamoto why he is not fighting back and Amagai reveals his Bakkōtō's ability to Ichigo. Ichigo then resolves that Amagai truly is an enemy and asks who he is. Yamamoto question how he knew Shin'etsu Kisaragi's name. Amagai then reveals that Shin'etsu was his father and that Yamamoto had killed him. Ichigo questions Yamamoto if this is true and the Captain-Commander replies that it is. Yamamoto asks how Amagai knew that he was the one to kill his father and Amagai says that he had gone looking for his father the day he died and found him on the brink of death. His father had told him that Yamamoto killed him. Ichigo and Rukia cannot believe this but Yamamoto remains still. Amagai then reveals that he changed his anme and entered the Gotei 13 in order to find out why his father was killed. He remembered the last word his father said to him, Bakkōtō. He explains that his father had broken into the Kasumiōji grounds to expose the Bakkōtō but was silenced by Yamamoto. Amagai says that he trained endlessly to beat Yamamoto, gained a Bakkōtō of his own and finally became a captain to avenge his father. He then raises his blade and sends out a wave of fire towards Yamamot but Ichigo blocks it. Amagai tells Ichigo to move out of the way but Ichigo refuses, calling Amagai selfish and says that his selfishness has caused harm to others, especially Rurichiyo. Amagai continues to tell Ichigo to get out of the way but Ichigo says that if Amagai wants him to move, he'll have to do it himself.

Ichigo tells Rukia to look after Rurichiyo and then activates his Bankai. Amagai begins to spin his sword, sending several blasts of fire at Ichigo who manages to block and dodge them all. Ichigo swings at Amagai but the traitorous captain flashes away before pouncing down on Ichigo with his Bakkōtō and overpowering him. Ichigo wonders how this happened and Amagai explains again that he can seal away a Zanpakutō's power. Amagai tells Ichigo to give up but he refuses. Amagai says that no matter what Ichigo does, Rurichiyo's fate is sealed and then tells Rurichiyo to curse the fates that she was born into the Kasumiōji clan. Ichigo angrily charges at Amagai and the two trade blows. Amagai taunts Ichigo, saying he will never cut him with such weak swings. Amagai then grabs Ichigo's sword and throws him. Ichigo recovers and tries to fire a Getsuga Tenshō but the resulting attack is very weak and Amagai merely sidesteps it. Amagai beings to question how Ichigo used a Getsuga, noting that his Bakkōtō should have sealed away Ichigo's reiatsu.

Amagai calls out to his Zanpakutō and it lights up in an overwhelming flame. He then fires a large blast of fire at Ichigo who barely manages to get away in time. Amagai tells Ichigo that he cannot spend all day fighting him and stabs his sword into the ground. A pillar of flame erupts from beneath the ground Ichigo is standing on and Ichigo manages to roll away. However, Amagai says he is not finished and does it twice more before appearing behind Ichigo in the air and hitting him with a large fireball, sending Ichigo crashing to the ground. Amagai lands and confronts Yamamoto again, apologizing for keeping him waiting and saying that it is his turn now. However, Ichigo gets up, wounded but taunting Amagai, saying that the real fight starts now. Amagai curses Ichigo. Ichigo says that despite Amagai sealing away the power of his Zanpakutō, he still has plenty of power left in him. Amagai then calls Ichigo a fool, saying he would have let him live had he just been good and stayed on the ground. Amagai then begins to twirl his Zanpakutō in the air, sending fireball after fireball at Ichigo, who continues to dodge before using Shūnpo to get away. Amagai panics for a moment, questioning why Ichigo is still so quick despite being under the influence of his Bakkōtō. Ichigo then comes crashing down but Amagai catches his sword once more and throws him. However, as he is doing so, Ichigo releases a point blank Getsuga, knocking Amagai back. Rukia notes that despite Amgai's Bakkōtō, Ichigo's reiatsu is increasing and Amagai notes that Ichigo shielded himself with his reiatsu.

Amagai calls out to Ichigo, asking what he gains from fighting him. Amagai says there is no reason for a Human to lose their life over a conflict in Soul Society. Ichigo angrily replies that that is not important. He says he is there to protect Rurichiyo and that is all there is to it. Amagai calls Ichigo a fool and begins increasing his reiatsu quickly. He says that id Ichigo's life is so worthless then he can die and slams his Zanpakutō into the ground, sending a gigantic wave of fire at Ichigo. As the smoke begins to clear, Amagai asks if it is over but Ichigo's echoing voice asks if what is over. A masked Ichigo then steps out from the smoke and declares that nothing is over. Ichigo then quickly disappears, causing Amagai to note how fast he is. Ichigo reappears in front of Amagai and swings his sword at him, knocking Amagai back a few feet. Ichigo then pursues Amagai, knocking him back again and forcing him into the air. Amagai notes that Ichigo's strength and power are far greater than before but as he then reexamines the ground below, he cannot find Ichigo. Ichigo then appears behind Amagai and swings down on him, giving Amagai but a second to respond by quickly turning and blocking with his sword. Ichigo follows Amagai downwards but Amagai breaks off at the last second.