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|Form of Government||None|
|Manga Debut||Chapter 70|
|Anime Debut||Episode 21|
The Dangai was originally both a penal colony and a passage to the Human World. The Kōryū (拘流, Wresting Flow) and the Kōtotsu (拘突, Wresting-Surge) are remnants of its time as a penal colony, they also act as a means of defense against unwanted intruders. The Dangai is an isolated space which is surrounded by numerous stacked-up layers of time's current, resulting in it being a place where the density of time within it to be extremely high when compared to other exterior dimensions. To be precise it is over 2,000 times denser, meaning that when one hour passes in the outside worlds, an equivalent of 2,000 hours pass inside the Dangai. The Kōtotsu exists to stop anyone from lingering in the Dangai and possibly exploiting this time distortion.
While the Dangai can be used to journey to and from Soul Society, Shinigami who have Jigokuchō do not use the Dangai to travel between Soul Society and the Human World. It is only used for that purpose by individuals who do not have a Jigokuchō. Indeed, even if these individuals pass through the Senkaimon with a Shinigami, they will be expunged into the Dangai due to their lack of Jigokuchō.
Kōryū (拘流, Wresting Flow) is the current that is constantly flowing through the Dangai, in order to prevent enemies such as Hollows from using it. The current stops souls from moving, and even one foot caught by it makes escape almost impossible. It encompasses the walls, capturing anyone who makes contact with them. While traversing the Dangai, Uryū Ishida and Ichigo Kurosaki (attempting to save Uryū using his Zangetsu) were almost captured by the current. Luckily only his cape was caught, and Chad was able to break him free. Upon their escape to Soul Society, Orihime Inoue used her Santen Kesshun to block the Kōtotsu, composed of the Kōryū, and escape, but Yoruichi Shihōin berated her for this action; while the Kōryū only touched the shield area of her ability, had any one of Orihime's Shun Shun Rikka been touched by the current, the entire group would have been killed. If a Shinigami's Zanpakutō is used or revealed, they are also trapped by the current.
When circumstances deem it necessary, the Kōryū can be stopped using a method referred to as Kaikyō Kotei (界境固定, Realm Boundary Fixation). Normally, lower-echelon Shinigami enter the dimension in great numbers and using a special method, pour in their Reiatsu to fixate the current. However, individuals in possession of significant quantities of Reiatsu can single-handedly suppress the current for extended periods of time, but only after the insertion of four small forked blades into various locations along the Dangai's wall, and as long as the user remains connected to these items for the duration. Isshin Kurosaki states that someone with his level of Reiatsu can maintain this state for no longer than 2000 hours, according to the time frame within the confines of the Dangai.
The Kōtotsu (拘突, Wresting-Surge), is the Dangai's equivalent to a street sweeper. The Kōtotsu appears once every seven days to cleanse the area - killing anyone and everything that makes contact with it - to assure that no one can loiter and take advantage of the time distortion. It looks like the same material that makes up the Precipice World, only molded into the shape of a bullet train, and a golden eye at the upper-center of its body. If the Kōtotsu touches a Zanpakutō or other spiritual weapon, the user and weapon are trapped, since the Kōtotsu's body is flowing with the Kōryū current. The Soul Society has no means of sealing the Kōtotsu. If a being is caught by the Kōtotsu, they'll be thrown out to a greatly different point in time from when they entered the Precipice World.
Being chased by the Kōtotsu has shown to lead to a time distortion. Ichigo trained for 10 days in the Human World, waited 7 days for the Senkaimon, and spent 5 days total afterward, before his 3-Day Bankai training. Logically speaking, this is a total of 25 days, which is exactly (at the time) one day before Rukia Kuchiki's execution after Ichigo's training is complete. However, as luck would have it, after being chased by the Kōtotsu, Yoruichi and the Ryoka entered a twisted time-space tunnel when they escaped the Dangai, making their actual arrival to Soul Society about 7 days earlier. This is stated by Yoruichi in her thoughts on the first day of training, so this left a total of 2 days training left, and 8 days following the training that could possibly be used as an extension. It is later determined that the reason for this particular time distortion was due to Urahara's technology, which made the penalty only end up being a few days. Normally a victim would have been blown away in increments of 100 years and die, as their body would not have been able to keep up with the rapid flow of time.
Ichigo Kurosaki and his friends traverse the Dangai to invade Soul Society, through Urahara's Senkaimon. They are chased by the Kōtotsu. After having spent a month training in Soul Society, Orihime uses it to cross back to the Human World with her two Shinigami escorts, but is intercepted by Ulquiorra Cifer. The Dangai's defenses were turned off at the time. Later, Isshin opts to use the absence of the Kōtotsu to his and Ichigo's advantage by using the Dangai to teach Ichigo the "Final Getsuga Tenshō".
During The Kasumiōji Crisis, the 3rd Division is sent there to kill a group of Gillians and the then captain of the 3rd Division, Shūsuke Amagai, uses his Bakkōtō to protect his men by destroying the Kōtotsu, thus winning the trust of the initially hostile 3rd Division.
A month after Aizen's defeat, Lieutenants Nanao Ise and Rangiku Matsumoto are walking through the Dangai with their Hell Butterflies when their Hell Butterflies inexplicably turn into energy. Later, Mayuri Kurotsuchi leads an investigation into the Dangai with his Lieutenant Nemu Kurotsuchi, in which they encounter a misaligned Kōtotsu emerging from the walls. Also, when Rukia and Ichigo are in transit to Soul Society, they are confronted with a regenerated Kōtotsu, which they are forced to run from. In addition to this, the Dangai records were manipulated by Kagerōza Inaba in order to frame the Substitute Shinigami, Ichigo Kurosaki, as being directly responsible for the disappearances of the Shinigami. 
Appearances in Other Media
The Dangai was an integral plot-device for the first Bleach feature length film, Bleach: Memories of Nobody. It inadvertently spawned the Valley of Screams, and was revealed to play a role in the creation of Blanks.
In the game Bleach: Blade Battlers 2nd, the Dangai appeared as one of the stages. The Kōtotsu also appeared as a distraction to the fighters. Every once in a while it appears from the wall (marked by a flashlight coming from the wall and a noise) and hit the players who are jumping or standing in front of it, dealing damage instead of killing him/her instantly.
- ↑ Bleach manga; Chapter 70, page 9
- ↑ 2.0 2.1 Bleach manga; Chapter 408, page 4
- ↑ 3.0 3.1 3.2 Bleach manga; Chapter 407, page 17
- ↑ Bleach manga; Chapter 231, page 5
- ↑ Bleach manga; Chapter 70, page 10
- ↑ Bleach anime, Episode 323
- ↑ Bleach manga; Chapter 71, pages 7-9
- ↑ 8.0 8.1 Bleach manga; Chapter 408, page 6
- ↑ 9.0 9.1 Bleach anime; Episode 168
- ↑ Bleach manga; Chapter 407, page 3
- ↑ 11.0 11.1 Bleach manga; Chapter 132, page 18
- ↑ Bleach manga; Chapter 407, page 14
- ↑ Bleach manga; Chapter 71, pages 1-7
- ↑ Bleach manga; Chapter 234, pages 1-9
- ↑ Bleach manga; Chapter 407, pages 17-18
- ↑ Bleach anime; Episode 317
- ↑ Bleach anime, Episode 321
|Human World||Kagamino City · Karakura Town · Karakura High School · Karakura Hospital · Kurosaki Clinic · Urahara Shop · Bount Mansion · Naruki City|
|Soul Society||Rukongai · Seireitei · Soul King Palace · Central 46 Compound · Nest of Maggots · Shin'ō Academy · Sōkyoku Hill · Gin Tonbo · Kuchiki Family Manor · Central Great Underground Prison · Wandenreich City · Silbern|
|Hueco Mundo||Forest of Menos · Las Noches|
|Others||Hell · Dangai · Valley of Screams|