User:Ohmystars/sandbox

=History of Kimetsu No Yaiba universe=

Heian period (平安時代) (794-1185)

 * Around 900s: Muzan is born into what would be the future Ubuyashiki Clan, likely in the Heian capital (modern day Kyoto)
 * A doctor who lived around Mt. Kumotori in the Kanto region (modern day Tokyo area) uses the blue spider lilies that grow there to try to create a medicine to treat Muzan. Thinking the medicine isn’t working, kills the doctor partway through treatment.
 * Five of Muzan's wives commit suicide due to his harsh tongue
 * The Ubuyashiki clan’s children keep getting ill. They are told their family carries a curse for Muzan having come from their bloodline, they swear to eliminate Muzan.

Genpei War (源平合戦) (1180-1185)

 * The war sweeps Kyoto and many other parts of Japan into violence, over the centuries thereafter the seat of power switches from Kyoto to Kanto. Muzan has moved to Kanto.
 * Swordsman in the Corp do not yet use Breaths and fight in whatever method they can, at some point they began using Nichirin blades because the ore soaks the sunlight. While their sword forms are already in reference to the basic Breath forms we’d know later, they are not yet using Breath techniques. The Pillar system is already in place.
 * Rengoku family already practices Kankagari, hence the hair color.

Sengoku period (1467~1615)

 * Early 1460s: Twins Yoriichi and Michikatsu are born around Onin War (1467-1477) to the Tsugikuni Clan.
 * Michikatsu brings Yoriichi a flute
 * Akeno (their mother) gives Yoriichi hanafuda earrings at 7 years old, watches Michikatsu fight, one shot at father's retainer
 * At 8 years old, mother Akeno dies at 24 years, Yoriichi leaves home. Father goes to temple. Yoriichi encounters Uta.
 * At 18 years old, Yoriichi and Uta wed and settle on Mt. Kumotori.
 * Around this time, Michikatsu is also wed.
 * Father dies at age 35.
 * When Uta is soon to give birth, she is killed by a demon and when Yoriichi finds her, he stays by her corpse for about 10 days. He is found by a Rengoku ancestor, who invite him to join the Demon Slayer Corp.
 * Yoriichi begins teaching Breath techniques to other Corp members, their demon fighting abilities rapidly get stronger. He gets along very well with the Pillars, who improve their swordsmanship rapidly. They cannot quite manage Sun Breathing, but make the five basic off-shoots: Rock, Water, Wind, Thunder, and Flame. Rengoku keeps many records of this time which are handed down throughout his family.
 * Yoriichi rescues Michikatsu from a demon. Michikatsu is so taken by Yoriichi’s Sun Breathing that he abandons his family to enter the Corp and dedicate himself to learning that technique. He does not pick it up, but develops Moon Breathing. He attains a mark like Yoriichi’s, and many other slayers have attained marks as well. Michikatsu is concerned about being the best and passing on his legacy, Yoriichi still doesn’t care about these things.
 * Tamayo becomes a demon.
 * Early 1480's: The young Kamado newlyweds, Sumiyoshi and Suyako, come across Yoriichi’s empty former home on Mt. Kumotori
 * The young Kamado couple (including a very pregnant Suyako) is attacked by a demon, but Yoriichi, who happened to be passing through and wanting to stop by the place he lived with Uta, rescues them. Yoriichi is also the one who fetches a midwife (extremely quickly) for Suyako to give birth to Sumire. Shortly after Sumire is born the following day (in early spring), Sumiyoshi already insists that he’ll tell future generations about Yoriichi, but Yoriichi sternly tells Sumiyoshi that he hasn’t been able to save anyone, and not to see him as any kind of special person, and disappears.
 * Mid-1480s or two years after Yoriichi saves the Kamado family: Those with marks begin to die off by the age of 25. Michikatsu is distraught, and Muzan approaches him, declaring that he is curious about what will happen if he makes a demon out of a Breath user, and giving him the choice to live on forever or die early because of his mark. Michikatsu choses to become a demon, and he maintains a loyal and open relationship under Muzan ever since.
 * Yoriichi encounters Muzan, Muzan declares he no longer has any interest in Breath users (after all, he didn’t master the sun, dang it). Yoriichi feels he was born to defeat this man, delivers a stunning display of Sun Breathing, but the little pieces of Muzan that get away altogether form roughly the size of a head. Tamayo is freed from Muzan’s curse and tells Yoriichi as much as she can about Muzan, including that he probably won’t appear again in Yoriichi’s life. Yoriichi lets her go.
 * Yoriichi is then informed by Corp members (including Rengoku) that Michikatsu has become a demon. In addition to Yoriichi failing to kill Muzan (give him a break, guys) and letting Tamayo go, makes some Corp members demand Yoriichi’s suicide to atone, but the 6-year-old Oyakata-sama (whose father is still alive, but likely incapacitated) puts a stop to this. Yoriichi is exiled from the Corp and told to kill his brother. Some members of the Corp (in particular, Rengoku) stay in touch with Yoriichi with Oyakata-sama’s tacit permission.
 * Muzan lays low a while, but Michikatsu brings him the head of Oyakata-sama (this is the head of the child who oversaw Yoriichi being exiled). The Corp henceforth enacts much stricter secrecy, and this is also around the time Kakushi are organized.
 * After being kicked out of the Corp, Yoriichi visits Sumiyoshi one fall, wanting to tell someone about his life. After sharing his story, he receives flowers from Sumire, and at Suyako’s request, he performs Sun Breathing. Sumiyoshi memorizes it by watching, and promises to pass it down. Yoriichi leaves him with the earrings his mother Akeno gave him, and keeps the toy flute from Michikatsu and a scrap of Uta’s kimono.
 * 1545-ish: Yoriichi is over 80 years old and finally finds Michikatsu/Kokushibo. Yoriichi barely fails to kill him and Breaths his last. Kokushibo cut the flute in half when cutting Yoriichi’s standing corpse, but keeps the pieces with him.
 * After Yoriichi’s death, Muzan goes on the offense again, eliminating anyone with knowledge of Yoriichi’s Sun Breathing techniques. The Corp is essentially erased for a time, and thereafter, they no longer find themselves as strong as they were in Yoriichi’s time. According the Rengoku records, this is because there was never any teacher as good as Yoriichi after that.

Edo period (江戸時代, Edo jidai) 1603 and 1867

 * Over two hundred years pass of Muzan trying to find the blue spider lilies or create a demon that can master the sun, and swordsman polishing their Breathing techniques as they slay demons. By this time we can assume most of Muzan’s activity is based around the Kanto area in the bustling Edo period.
 * Around the later decades of the Edo period, Muzan gets the idea to make the Twelve Moon Demons with a large amount of his blood. Hantengu might be the first, then Akaza any time between 1785 and 1800,
 * Douma’s formation was after this
 * Gyutaro’s still later
 * All of the Upper Moons were in place by no later than 1802, as they have not been called to the Infinity Fortress all together in 113 years.

Meiji era (明治) 1868 - 1912

 * The following hundred years is full of a cycle of Pillars and the Twelve Moons pit against each other while the common riffraff fight the common riffraff. While the Pillars kill Lower Moons as a rite of passage and they are constantly changed out as openings occur, the unchanged Upper Moons routinely kill and eat Pillars. Even at the bottom rung, Daki has eaten 7 and Gyutaro has eaten 15. For each of those Pillars, at least one Lower Moon or fifty demons has died.
 * Hand Demon becomes demon.
 * 1863 and 1869: Hairou, a Shinsengumi member, becomes a demon.
 * 1868: Hand Demon was locked away on Mt. Fujikasane
 * around 1892: Ubuyashiki Kagaya born. His father couldn’t take the sorrow of being in that position, so when he committed suicide at the age of 19. Kagaya assumed the role of the 97th generation Oyakata-sama at age 4 (his other siblings, all brothers, had died).
 * He very soon married Himorogi Amane when he was age 13 and she was age 17.
 * 1906: Of the current Pillars, Kagaya first met Himejima in 1906 at the age of 14.
 * Around 1907: The quintuplets, including Kagaya’s heir Kiriya, born
 * Around 1908: Murata becomes demon slayer

c. 1913:

 * February 2~5, 1913: Muzan takes a stroll to Mt. Kumotori and snacks on Kamado family, tries making one of them (Nezuko) into a demon, assumes it didn’t work and she died so he forgets about her (giving Nezuko an opportunity to break free of his curse). He finds no blue spider lilies and goes back to Tokyo.
 * Tanjiro finds his family slain by Muzan, and Nezuko turned to a demon. Giyu arrives and lets Tanjiro and Nezuko go. Tanjiro took at least a couple days to reach Mt. Sagiri with Nezuko. Tanjiro starts training with Urodokai for 2 years
 * Rengoku Kyojuro defeats Hairou and became a Pillar.
 * Wanting to get close to business partners, he identifies a high society woman named Rei, kills her husband, and swoops in to be her new lover.

c. 1915:

 * Early winter 1915: Tanjiro, Zenitsu, Genya, Kanao, Inosuke participates in Final Selection. Tanjiro spends 7 days there, then recovers for 15 days until Haganezuka arrives with his sword.
 * Within days, arrive at the site of the Swamp Demon after receiving his first mission.
 * 2 days after that, he arrived at Asakusa and encounters Muzan and Tamayo/Yushiro.
 * Tanjiro encounters Zenitsu on his way, receives new mission and goes to Drum Demon House. Meets Inosuke that same day.
 * Around 2 weeks: recovery at the Wisteria Crest House. The light novels imply the boys hung out long enough to be invited to a local wedding in town and for Tanjiro to go on a midnight flower-picking escapade. This was also their chance to makes friends, even if Zenitsu and Inosuke might not yet call each other that.
 * Upon receiving their mission, they depart, and they spent one night in battle on Mt. Natagumo.
 * Twice-a-year Pillar meeting is hold.
 * Kanao has gone from Mizunoto to Tsuchinoto
 * 2-3 weeks; Tanjiro receives treatment at the Butterfly Mansion after Zenitsu and Inosuke, and they spend another period of time in bed to heal. Nezuko probably spent most of this time sleeping. During that time, the anime adds a scene of Shinobu making an additional visit to the Ubuyashiki Mansion, as Rengoku receives his mission (perhaps the one to go investigate the disappearances on a train?).
 * Around 2-3 months; Functional Recovery Training, which Tanjiro and Inosuke participate in for 14 days while Zenitsu spends more time in recovery. Once Zenitsu starts, he and Inosuke both quit within 6 days. Tanjiro spends another 10 straight days losing to Kanao. He then engages in 15 days of Breath training on his own before having a little rooftop talk with Shinobu, and then in another 10 days, he’s able to blow up a big gourd. While there might had been more days in between, Zenitsu and Inosuke finally come around and start Breath training too, and 9 days later, they are able to maintain constant Total Concentration Breathing (this speed is attributed to Shinobu being a good teacher and Tanjiro sucking at teaching). Over some indeterminate number of days later, Tanjiro & Inosuke receive new swords, and Enmu receives a big whopping of Muzan blood.
 * Mugen Train: Tanjiro & Co. receive their mission, and some indeterminate number of days later (very possibly the same day), they arrive at the train station, and spend one night in battle.
 * While we don’t know how long they kept Tanjiro in bed before he went out to the Rengoku estate (possibly quite a distance away in a southwest Tokyo suburb), but at least long enough for the funeral proceedings to already be over and done with.
 * Four months following Rengoku’s death, the boys generally reside and train at the Butterfly Mansion between individual missions they go on.
 * Tanjiro, Inosuke, and Zenitsu are all Kanoe.
 * Summer: Tengen, Tanjiro and co go to Yoshiwara. Tanjiro & co spend only 1~2 nights undercover in Yoshiwara before the day Zenitsu encounters Daki. The following day Uzui tells Tanjiro & Inosuke to leave, but they all head into battle that night. Before sunrise, all three boys fall unconscious due to their injuries.
 * Tanjiro spends the next two months in a coma. After waking up, he spends one more week in bed and is soon recovered enough to go out to the Swordsmith Village (unclear number of days possibly spent in Functional Recovery, but he’s basically fully healed after that extra week in bed).
 * Around september - november: Unclear number of days to reach Swordsmith Village, he hangs out with Mitsuri on the very first night there. gets hit in the head with Genya’s tooth.
 * The following day, Tanjiro meets Kotetsu and begins training with the Yoriichi Type Zero battle doll. Tanjiro’s starvation begins, he survives on rain water while Kotetsu denies him sustenance for the following 7 days. For the first 5 days the doll held paddles, but by the 7th day they’ve been exchanged for swords. Tanjiro gets a hit in and Kotetsu grants him food. Tanjiro continues training for an unclear number of days after that before the sword emerges. Tanjiro has held on to Genya’s tooth for well over a week.

(By the Taisho period, blue spider lilies grow at the spot where Uta was buried.