Repost from the old old forum. TY Google Cache.
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OK so I had this on the old forum but it got deleted so Im recreating it. A full timeline and explanation of all things Onmyou Taisenki.
This post includes the history of the 3 sects, the story of the manga, the backstory for the anime, and a summary of the first half of the anime.
Be advised: Its possible that I got the timing off for the manga because there seems to be a time skip right after Yakumo gets the Zero Drive. Please help me out if you can!
1200 years ago
-Japan was divided into many states that constantly made war on one another. Eventually the Shikigami were involved in these battles. Because of these battles, all the Shikigami ended up in Naraku and many children lost their parents.
-With the loss of the Shikigami the 24 seasons were thrown into chaos. Many people died because of the harsh weather.
-During this time a boy with no name was born who lived in harmony with nature. This boy befriended the youkai who plagued the land and named himself Kuu Utsuho.
-Many orphans and lost people gathered around Utsuho where he lived in the woods and mountains. These people included Gasshin, his older sister Usubeni and a young man from Kyoto named Taizan. There they founded a village and the Shikigami granted Utsuho the power of the Yondaiten.
-Using this power Utsuho and the villagers traveled around the country and used the Yondaiten to restore Japan to its former beauty. They also sealed the youkai in their own realm so they could no longer harm people. This was the Fukumaden.
-However those who sought the power of the Yondaiten trick Utsuho who knew no distrust. Taizan betrayed the location of the village to government Toujinshi and Utsuho and his followers are sealed inside the Fukumaden are sealed within the village using the Mirror In. Those lost include Usubeni who loses Seiryu no Kibachiyo to Naraku. Taizan’s reasoning for his actions is that someone must be evil to protect all the kind villagers. Only Taizan and Gasshin escape.
-The fledgling Ten-ryuu and Chi-ryuu, now controlling the Yondaiten, pursued Gasshin and Taizan within the Fukumaden where they were eventually sealed
-The Ten-ryuu is formed to maintain the seal to the Fukumaden while the Chi-ryuu is born to defeat the youkai that escape.
-Overtime Utsuho will be affected by the madness and hatred of mankind and become wrathful and hateful.
1000 years ago
-The descendents of those who followed Utsuho now call themselves the Jin-ryuu and work in secret to undo the seal on him and the villagers.
-The Ten-ryuu have been using provisions from the Fukumaden to make themselves wealthier while many Chi-ryuu perish fighting youkai.
-The Ten-ryuu Souke, Raihou, is weak-willed and begins to be influenced by Utsuho. The Ten-ryuu deposes and imprisons Raihou and installs his sister’s son Youmei as the new Souke.
-The enraged Chi-ryuu attacked the Ten-ryuu base with the help of Raihou who had been released by Utsuho. Raihou forces a Chi-ryuu contract with Byakko no Kogenta and immediately uses a Daikoujin.
-The Chi-ryuu destroy the Ten-ryuu Dai Kimon and attempt to kill the Souke but are foiled by Youmei’s mother Shoushi who sends the toddler 1000 years into the future after his father Issei attempts to have him fight by giving him his Drive. The Ten-ryuu ceases to exist as a true organization from this point on.
-Youmei’s parents flee into the Fukumaden as the base is destroyed. Shoushi and Issei free Gasshin and raise him for a time. Shoushi passes her Drive onto Gasshin and asks him to use it to atone for the sins of the Ten-ryuu and tells him of Youmei’s appearance in 1000 years.
-Gasshin travels to Naraku and takes on his sister’s contract with Kibachiyo. After that he finds and frees Taizan who renews his contract with Souka no Onishiba and together they meet up with the Jin-ryuu on the surface: Zenjou, Shoukaku, and Taishin. During this time the Jin-ryuu try many times to undo the seal but fail.
-The Jin-ryuu have been foiled in their plot to free Utsuho and can find no method to undo the seal. Thus, Zenjou, Shoukaku, and Taishin seal themselves within the Fukumaden to wait 1000 years for Souke to appear.
-Masaomi and Taizan flee 1000 years into the future themselves with the intent of manipulating the Souke of that into undoing Utsuho and the villagers seal. Gasshin will act as Ten-ryuu Seiryu user Oogami Masaomi while Taizan will act as the Department Chief of the Ten-ryuu Subjugation for the Chi-ryuu. However, unlike Gasshin, Taizan is aware of Utsuho’s malice and plans to use it to create a world where Toujinshi rule.
The Recent Past
-Chi-ryuu Toujinshi Mikazuchi starts his own company which becomes incredibly successful due to his use of the Sakashiki with his Akagane no Itsumu. Through the Sakashiki he will come to be influenced by Utsuho.
-Mikazuchi usurps the role of Souke from the proper heirs and founds an incredibly strong and organized Chi-ryuu with the goal of creating four Kimon around the country and one great Kimon with which they will control the country.
-The Chi-ryuu begin to take aggressive actions against the remaining Ten-ryuu around Japan.
15-16 years ago
-A powerful Toujinshi named Mahoroba leads a sect of Toujinshi whose goal is to create the White World by destroying all the Yin or Evil in the world. This organization is headed by Mahoroba and his Five Revolving Element Kings
-On a mission to exterminate a very powerful youkai, Earth King Yoshikawa Monju is forced to sacrifice his Shikigami Byakko no Akatsuki (Kogenta's name at the time of his contract with Monju). Monju vows to never make a contract again.
-Sometime late Monju comes to believe that Mahoroba's White World is not truly justice and will destroy the balance of the Taikyokushin. Mahoroba allows Monju to leave his service despite Monju's vow to stop him at any cost.
-Many Earth Doctrine Shikigami rebel with Monju and are killed in retaliation. One of these is the father of the Houjou sisters who come to blame Monju for the murder.
9 years ago
-Youmei appears from the Kimon in Ten-ryuu’s Tachibana Shrine. Tachibana Soutarou realizes who Youmei is but chooses to raise him as his grandson Tachibana Riku.
5-6 years ago
-Monju is now the head priest of the Taihaku Temple in Kyoto. Mahoroba is nearing completion on his plan. Monju gets wind of this and heads to Mahoroba's location with his head priestess Izuna.
-Inside Mahoroba’s headquarters Monju defeats Gyoujaku no Kaniemon and Aogane no Tsukumo. Monju comes across his former master just as he’s completing the Sakashiki ceremony. Monju binds Mahoroba and with Izuna takes his former master back to Taihaku Temple.
-Monju and Izuna attempt a Toujinshi Burial on Mahoroba, but Mahoroba completes the Sakashiki Ceremony despite his sealing. With his youth restored, Mahoroba summons Byakko no Rangetsu to destroy Monju.
-Having returned home, Monju’s son Yakumo takes up his father’s Toujinki to defend Monju. Upon touching it Yakumo is tested by the Taikyokushin who determines that the Byakko species is suitable for Yakumo. With this Akatsuki is reborn as Byakko no Kogenta.
-Having no idea how to use a Toujinki, Monju directs Yakumo’s actions. The battle seems evenly matched until Monju passes out leaving Kogenta and Yakumo to bicker. Kogenta instructs Yakumo to call him by the name he gave him but despite the new teamwork they are defeated by Rangetsu and Mahoroba who spare them.
-Before leaving Mahoroba seals Monju using the Human Pillar Technique and Yakumo is forced to face the dangerous life he has chosen. Monju implores Kogenta to protect Yakumo.
-Mahoroba sends his minions out to change the flow of time and thus expose the Taikyoku so that he may obtain it. Izuna shows Yakumo the Mirror of Time with which he will traverse time so as to stop Mahoroba. Kogenta and Yakumo continue to bicker but Kogenta promises to strengthen Yakumo as per his promise to Monju.
-Yakumo uses the Mirror to travel the 10th year of the Tenshou Era. It is the last stand of Oda Nobunaga and Mahoroba’s minion Ranmaru acts as Nobunaga’s aide trying to compel him to live on and take over Japan. Nobunaga on the other hand has accepted death and when Ranmaru calls for Ikazuchi no Takamaru, Yakumo and Kogenta defend him.
-The battle goes poorly for Kogenta and Yakumo due to Takamaru’s speed; however, Kogenta explains that as he is an Earth Type and Takamaru is a Fire Type they actually have the advantage. Yakumo slices the In to attack directly and finishes Takamaru. Yakumo receives an attribute changing talisman and Nobunaga executes Ranmaru. Nobunaga thanks Yakumo and dies in the fire caused by their battle. Yakumo returns home stronger.
-Yakumo trains at home in the basic In and Kogenta instructs him of the Five Elements. Having previously been spurned in her attempts to train him, Izuna gives Yakumo a difficult task. Yakumo must defeat three Kamaitchi Youkai and thus gain his father’s gauntlet and forehead protector. Yakumo accomplishes this task with the advice Izuna.
-Mahoroba calls together his four remaining Five Element Kings: Fire King Shiranui, Metal King Kagerou, Wood King Unryuu, and Water King Nagi. The Kings witness the power of the Sakashiki and the growing threat that Yakumo presents. Kagerou elects to defeat him.
-Yakumo travels to the past and finds an old man Toujinshi controlling Ikazuchi no Fusanoshin already in combat with Kagerou and his Kurogane no Fuji. The man’s village is already in flames. Working together they manage to defeat Kagerou who retreats. Yakumo is scolded in the present by Izuna for being rash.
3 years ago
-The Asuka family happily runs a Chi-ryuu shrine in the country side of Japan, but on the day of their eldest son Yuuma’s Toujinshi inauguration, Mikazuchi pays their father a visit after which he disappears having been place under the Human Pillar Technique at the Chi-ryuu base. The Asuka’s mother soon follows her husband to Tokyo.
-Out of desperation Yuuma makes a contract with Byakko no Rangetsu in order to protect others like his father. Yuuma and his younger brother Souma travel to Tokyo and witness the supposed defeat of their mother and her Ikazuchi no Fusanoshin.
-Yuuma becomes Mikazuchi’s protégé and Souma goes to the Chi-ryuu orphanage and eventually makes a contract with Fusanoshin using his mother’s Drive.
Present Day
-Youmei is now known as Tachibana Riku grandson of Soutarou. Riku begins middle school with his childhood friend Jouzenji Momo. At school Riku befriends a boy named Yamase.
-When Riku takes Yamase to see the shrine that his grandfather tends to it is revealed that Yamase is a Chi-ryuu Toujinshi. Soutarou, a Ten-ryuu priest instructs Riku to take the Drive and Riku makes a contract with Byakko no Kogenta in order to defeat Yamase’s Aogane no Tsukumo. Soutarou slips into a coma due to the fatigue.
-The Chi-ryuu is now aware of a new Ten-ryuu Byakko user and sends many Toujinshi to defeat Riku over the course of the next few weeks but all of them lose.
-Meanwhile, Riku joins Tenjin Middle School’s boat with Momo and two new friends Asou Rina and Kamiya Ryuuji and their teacher Yumi-sensei as the coach. Riku is also roaming the countryside on the weekends searching for new In for Kogenta and learning more about the ways of the Toujinshi.
-Not long into this, Riku encounters Chi-ryuu’s Byakko user, Asuka Yuuma and his Byakko no Rangetsu who overwhelm Riku. Riku is saved at the last minute by Masaomi who gives Riku a Ryuuhashou and Drive holder.
-Riku meets fellow Ten-ryuu Toujinshi Saigo Teru and his Akagane no Isoroku while searching for In. The two remain comrades after fighting a tag team battle together.
-Masaomi relates to Riku that Ten and Chi fight because the Chi-ryuu want to open the way to the Fukumaden while the Ten-ryuu want it closed. Masaomi teaches many things to Riku about being a Toujinshi.
-Yuuma suspecting that Masaomi might be the Ten-ryuu Souke confronts him at the Seiryu Festival Shrine and the two begin a longstanding rivalry.
-Yuuma’s little brother gets fed up with working for the man who killed his parents and is excommunicated from the Chi-ryuu by his brother. Souma and his Ikazuchi no Fusanoshin come to stay with Riku at the inn.
-Riku is confronted by the powerful Izou of Chi-ryuu with his Kurogane no Fuji and defeats him without using the dangerous new technique taught to him by Kogenta.
-Soutarou finally awakens from his coma and tells Riku to go to the Taihaku Temple in Kyoto. After that he disappears on a journey.
-In Kyoto Riku meets a Toujinmiko named Nazuna and her Hiiragi no Horin who show Riku the remains of the Ten-ryuu base where Riku retrieves the Tsuki no Magatama. This is the first sign that Riku is the Ten-ryuu Souke.
-Riku and Nazuna are soon joined by Teru and the three battle Izou and his minions. Izou escapes yet again.
-Soon Yuuma confronts Riku again at the Taihaku Shrine. After a largely one sided battle Riku and Kogenta turn things around by using the Daikoujin to defeat Yuuma and Rangetsu but a heavy price as Kogenta slips into a coma. Yuuma is saved by the timely intervention of his fiancé Mizuki, daughter of Mikazuchi, and her Kanro no Kuradayuu.
-Meanwhile Masaomi confronts Ten-ryuu strongest Toujinshi Yoshikawa Yakumo in the Fukumaden. Yakumo has doubts about Masaomi’s status as a Ten-ryuu. The two battle to a draw.
-When Riku returns to Tenjin City Nazuna comes to live with him and Souma much to the chagrin of Momo and Souma who put out by Nazuna’s elitist Ten-ryuu attitude.
-Soutarou returns briefly and presumably rebuilds the destroyed Tachibana Shrine. This allows Riku and his friends the use Kimon there in conjunction with the Tsuki no Magatama to enter Fukumaden.
-Over the next few weeks Riku will enter the Fukumaden several times to battle Toujinshi from Chi-ryuu’s Fukumaden Investigation Department for the Toujin Stones that seal each Fukumaden field. Mizuki is one these Toujinshi as is a now insane Izou along with Shigeru Mutsuki and his Gyoujaku no Ebihiko.
-On one of these excursions Masaomi tricks Riku into undoing a seal on fellow Jin-ryuu Toujinshi Taishin.
-At some point during this time Teru makes contact with Riku and the others. This will be the first of many times he asks them to help him get out of debt and fight youkai on the side.
-Pushed to the brink Izou overhears that one can use a Toujin Stone to force a Daikoujin. In the Fukumaden Riku is confronted by this mad man and Fuji is forced to go Daikoujin despite the great pain. On the brink of losing Kogenta goes Daikoujin and mercy kills Fuji. As the field rips apart Riku and an unconscious Kogenta are lost in the Fukumaden.
-When Riku awakes he attacked by Jin-ryuu’s Taishin who assumes Riku is Yakumo: Jin-ryuu’s worst fear. Riku is saved by the real Yakumo who’s Seiryu no Buryune battles Taishin’s Shousetsu no Magahoshi to a standstill. Masaomi looks on in chagrin as Yakumo explains to Riku about the third sect and the supposed devil Utsuho. Masaomi and Riku return to the surface world once Yakumo has gone.
-Riku and Kogenta travel to a secret part of the Fukumaden that Riku’s mother once took him to. The field has a perfect balance of all the seasons and symbolizes the perfect Kyoto. There Riku remembers the In that his mother taught him and uses it to protect the field.
-Soon Yuuma comes to the Tachibana Shrine for a rematch. Riku and Kogenta seem to have the upper hand as Riku slips into a trance and begins remembering his past and uses many new In. Yuuma is about to lose when he transforms Rangetsu into a Daikoujin and wins the battle decisively. Riku rejects his contract with Kogenta and loses his memories.
-For several days Riku lives a normal life again as his Toujinshi friends try to make him remember. Eventually Masaomi takes Riku to Naraku to retrieve Kogenta. Meanwhile Yakumo enters Genbu no Rakusai’s area of Naraku to retrieve his Zero Drive and get new Shikigami. In Naraku Yakumo meets up with his old Shikigami Kogenta and the two reminisce while Riku comes to accept his past as Ten-ryuu Souke.
-Riku and Kogenta renew their contract and with Yakumo the travel the Fukumaden where the again meet Taishin in battle. When Taishin use a powerful Daikoujin Yakumo unseals his Zero Drive and calls forth all five of his Shikigami: Shousetsu no Tankamui, Ikazuchi no Takamaru, Kurogane no Rikudou, Enoki no Sanemaro, and Seiryu no Buryune. Taishin is soundly defeated.
-Upon returning Riku resolves to see Mikazuchi and question him as to the Ten-ryuu’s supposed sins. With Souma he heads to Tokyo and there is told by Mikazuchi that the Ten-ryuu used the Chi-ryuu to become wealthy while the Chi-ryuu died in droves. Also while at the Chi-ryuu base Riku is confronted by Yuuma and Riku accepts a challenge declaring his belief that Rangetsu was the Daikoujin that destroyed his parents and home 1000 years ago.
-On top of the Mikazuchi Building Riku and Yuuma go all out eventually transforming Kogenta and Rangetsu into Daikoujin. From the shadows Masaomi transforms Kibachiyo into a Daikoujin to protect Riku; however his attempt to destroy Rangetsu is foiled by Mizuki who sacrifices Kuradayuu to save Yuuma.
-At the same time Mikazuchi and the four department heads open the Dai Kimon using their Daikoujin and the power of the Yondaiten causing it to snow in Japan’s Kanto region despite it being the beginning of September.
In the end Yuuma and Mizuki are lost in the Fukumaden and Riku escapes with his life.