Arrival in Karakura Town

Prelude
In the fake Karakura Town, when Ichigo turns to look at Aizen's fight against his father, Urahara, and Yoruichi, Gin appears behind Ichigo and remarks that Ichigo shouldn't turn away with him nearby. He goes on to tell Ichigo that he is no longer a warrior, Shinigami, Hollow or even a Human anymore. He asks Ichigo if he thinks he can beat Aizen when his father, Urahara and Yoruichi cannot. Seeing how weak Ichigo's resolve is, he again offers to allow Ichigo to run away, saying he has lost interest in him and that Aizen will be disappointed to see him as he is. Gin finishes by saying that Ichigo 'knows' about Aizen's power. He then tells him that is all the warning he will have and that if he won't run, Gin will finish him off. As Gin draws his Zanpakutō, he is stopped by Aizen. Ichigo sees that Aizen has completely defeated his opponents. Aizen then asks what Gin was going to do to Ichigo.

Gin replies that he was merely testing Ichigo's strength. Aizen instructs Gin to open a Senkaimon so that they can attack the real Karakura Town in Soul Society, remarking that there is no need to destroy the Tenkai Kecchu since it will be more convenient to create the Ōken in Soul Society if they are attacking the Royal Palace. Ichigo tells him to wait, but falls silent as Aizen's body begins to shed his sleek new form as his "incubation" is complete. Aizen finds it fortuitous that his Chrysalis period has ended as he will be able to watch the demise of Soul Society with his own eyes. Before passing through the Senkaimon, Aizen tells Ichigo that he will leave him in the fake Karakura Town and come back for him after everything else is done. As he watches the Senkaimon close, Ichigo is approached by his father, freshly awake, who orders him to open another Senkaimon so they can go defend Karakura town.

Towards Reason's Horizon
As they travel through the Dangai Precipice World, Gin comments on the nostalgic feel of the place. Aizen agrees before they are confronted with the. Gin urges Aizen to get going but Aizen holds his ground, prompting Gin to comment that as the Kōtotsu is a being of reason and not Reiryoku, as such, nothing can be done to it with Reiatsu. However, Aizen continues to hold his ground and then destroys the Kōtotsu as it gets close. Aizen then asks Gin what he is afraid of, saying that reason is for those who cannot live without clinging to it. Aizen then invites Gin to come with him towards reason's horizon.

Seeing as Ichigo continues to stand in awe, Isshin head butts Ichigo to get his attention, asking him if he heard what he said. Ichigo plainly states hopeless. Isshin yells at him that he doesn't know if it is hopeless or not. Ichigo replies that they both know thet win beat a monster with Reiatsu like Aizen's. Isshin then realizes that, unlike himself, Ichigo is able to sense Aizen's Reiatsu. He tells his son to come with him. When Ichigo lingers Isshin asks what Ichigo intends to do instead. He yells at Ichigo, asking if he is just going to stand there crying about how he couldn't protect anything. He asks Ichigo to think carefully about the meaning of Aizen going to Karakura Town; he reminds Ichigo that if he does not go, everyone within Karakura Town will die by Aizen's hands. Ichigo's resolve returns and he asks his father to open the Senkaimon.

Once they arrive in Soul Society, Aizen notes that they are some distance away from where Karakura Town is. Gin asks Aizen not to make it sound as if it was his fault, blaming it squarely on Aizen's behavior in the Dangai. Aizen concedes that that might be the case and apologies. He invites Gin to take walk towards the Human World town. As they run through the Dangai, Isshin orders Ichigo to stop. Ichigo asks why they are stopping while in such a hurry. Isshin explains that he can't sense the Kōtotsu and says Aizen must have done something to it. Ichigo asks if it will be a problem and Isshin replies that it can be if left that way, but for the time being they can use it for their advantage. Since the precipice world is cut off from time and space, making it the perfect place for Isshin to pass his teachings. When Ichigo asks him what he wants to teach him, Isshin replies that he plans on teaching him about the "Final Getsuga Tenshō". As Aizen and Gin make their final steps towards Karakura Town, Keigo Asano is waking up from his sleep.

Arrival
Ichigo asks why his father wants him to learn in the Dangai. Isshin explains that due to the structure of the Dangai, time is 2000 times more compressed inside it; one year spent inside is equal to 2000 years outside. If the Kōryū catches you, the effect is lethal. If you are rammed by the Kōtotsu you are thrown out into a different time than the one you walked in from, which explains the time difference at the beginning of the Ryoka Invasion. It was only thanks to Urahara's skills that the time difference was so marginal; a greater time difference is also deadly. Now, since the Kōtotsu is gone, the Dangai is the perfect place to make up some lost time. Since time flows 2000 times faster inside the Dangai, if Ichigo trained inside for 2000 hours only one hour will have passed outside. Soul Society cannot halt the Kōtotsu, but Isshin can stop the Kōryū, using the Kaikyo Kotei a device which enables Shinigami to stabilize the Kōryū. Isshin will stabilize the Kōryū until his Reiryoku is depleted. He says he'll be able to last about 2000 hours, akin to three months. Ichigo must use this time to get his Zanpakutō to tell him about the Final Getsuga Tenshō. Ichigo assumes a meditative position with his sword laid across his knees. To test his concentration, Isshin tries whacking him over the head, proving he wasn't concentrating hard enough. Ichigo apologizes and says he never used this technique to commune before. As he resumes his previous position, Isshin explains that it is called Jinzen, a technique refined over millennia to enable communication with one's Zanpakutō. The techniques Ichigo has mastered so far have all been taken by force. Now, in order to proceed, Ichigo must experience all those thousands of years he has never touched before.

Keigo finds himself all alone in the streets of Karakura Town, with everyone else around him sound asleep. He begins to panic and runs crying through the slumbering streets, calling for someone to wake up. Suddenly he is clotheslined by someone and goes down. Looking back he sees his classmate, Tatsuki Arisawa. In his relief for seeing her he begins ranting and doesn't stop until she punches him in the face and tells him to shut up. He begins apologizing and Tatsuki yells at him, telling him to be quiet and follow her. She takes him to where she found Michiru Ogawa and Chizuru Honshō and tells him to carry Chizuru. Keigo loads Chizuru on his back and Tatsuki warns him against touching her butt. Keigo denies having such intentions but seconds later informs her that Chizuru's breasts are bigger than he imagined, earning him another punch in the face. Tatsuki says she's patrolled the outskirts of the town and found that it just cuts off with nothing but mountains beyond it. She says she thinks the entire town has been transported to another world. Keigo asks if she thinks it has something to do with Ichigo. Tatsuki replies that she's sure of it but that she is equally sure Ichigo will put things right, since that's the kind of person he is. As Aizen reaches the edge of Karakura town he comments on how unsightly its image is. In the Dangai, a spray of blood from Ichigo's shoulder tells Isshin his son has succeeded in performing his Jinzen.

Ichigo opens his eyes and finds himself underwater. He frantically tries to make it to the surface but his robe is caught by the hand of a mysterious assailant and he is thrust against the roof of a building. The stranger floats above him as Ichigo struggles to breathe; he tells him to relax and breathe normally and Ichigo is surprised to find he can breathe freely. Ichigo inquires with the stranger who he is, since only Zangetsu is meant to be in his inner world. The stranger remarks that it is a very rude way on Ichigo's part to address the person who taught him how to breathe. Saying that, he materializes Tensa Zangetsu out of the thin air. As the man removes the hood covering his face Ichigo is amazed to see before him a young man with bright eyes and long black hair. The young man says it's no surprise Ichigo can't recognize him as it is the first time he comes into his internal world while in Bankai. With those words the young man attacks. Ichigo blocks and asks him if he is Zangetsu. The man denies and asks Ichigo what the name of his Bankai is. He then introduces himself as Tensa Zangetsu.

In the Dangai Isshin sees the physical toll Ichigo's body takes as a result of his internal struggle and states that Zangetsu will be violent this time. He adds that his Engetsu was the same; the Zanpakutō are reluctant to teach them this technique - Ichigo will soon learn why. Ichigo asks Zangetsu to hold up, saying he hasn't come there for a fight this time; he just needs to ask a question. Zangetsu guesses Ichigo has come to ask about the Final Getsuga Tenshō. The surprised Ichigo is in the middle of asking about it when Zangetsu swings his sword in a way that nearly decapitates Ichigo, who dodges it at the last split second. When Ichigo confronts him, Zangetsu maintains he cannot teach Ichigo that technique; Ichigo retorts that he cannot leave without learning it. He must know it in order to protect Karakura Town. Zangetsu grabs Ichigo's arm, stopping his unresolved assault. He says he doesn't care what'll happen to the things Ichigo wishes to protect. He swings his sword, landing a hit on Ichigo and pushing him against another building. He tells Ichigo they have different agendas when it comes to the thing they wish to protect.

A Karakura Town citizen, dazed and confused after waking from his enforced sleep, finally sees another person up and about - Sōsuke Aizen and Gin Ichimaru. He approaches them and asks if they know what happened. Aizen ignores the man's question and warns him to stay away. As he passes next to the man, about a quarter of the man's body dissipates and he falls lifeless to the ground. Aizen explains that normal Humans cannot sense his Reiryoku, but their bodies cannot withstand its presence. A trail of dead Humans marks Aizen's passage through Karakura Town.