In the Doomed Megalopolis OVA, Kato torments an innocent woman - Yukari Tatsumiya - and curses her into becoming his instrument for awakening Masakado. Despite the efforts of the onmyoji Hirai, Kato takes Yukari and uses her as a medium for ressurrecting the slumbering spirit. Masakado briefly awakens only to refuse Kato's desire for the destruction of Tokyo. However, one of the spells Kato has cast on Yukari is the magic of En, an impregnation spell. Gazing into the future, Kato determines Yukari will become pregnant with what he believes to be his child, who will be a much more suitable medium for Masakado's spirit. After this, Kato disappears for 10 years, and when he returns he comes for Yukari's daughter Yukiko, attempting to use her as the vessel of Masakado's ressurrected spirit. This attempt fails too as Yukiko also proves to be an unsuitable medium (as she is really the child of an incestuous union between Yukari and her brother, Yoichiro) and Masakado violently attacks Kato for disturbing him.
After Tokyo is rebuilt following the Great Kanto Earthquake, Kato returns again, this time attempting to awaken the Dragon of the Earth which sleeps beneath the city. Kato tries to sacrifice Yukiko to the dragon, only to be stopped by Keiko Tatsumiya, wife of Yukiko's true father and her mother's own brother, Yoichiro Tatsumiya. Though Yukiko is rescued and Kato seemingly vanquished, he returns months later and uses all his powers to pull the moon out of orbit, threatening to destroy destroy Tokyo by angering the Firmament Dragon. Keiko Tatsumiya again defeats Kato, but this time not through combat. Keiko reveals herself to be the Bodhisattva Guayin, a mortal representation of the Buddhist goddess of mercy, the polar opposite of the hatred and wrath that Kato represents. When Keiko confronts Kato, she does not attack him directly and merely shrugs off Kato's assaults, her body radiating spiritual energy. Realizing that he is vulnerable to the power of mercy, Kato panics and cries out defiantly as Keiko approaches him and embraces him. Kato accepts his defeat as Keiko holds him and the two kiss, their powers cancelling each other out. Kato's temple suddenly explodes as his spell is undone, returning the moon to its original orbit.
Tokyo: The Last Megalopolis and Doomed Megalopolis though only cover the first 1/3rd of the original novel of Teito Monogatari. In the original novel, Keiko manages to stop Kato from disturbing the orbit of the moon, however she is taken as his prisoner in the process and forced to accompany him to Manchuria, China. In China, Kato is regaled as a hero by native guerilla forces fighting Japanese oppression. Eventually World War II dawns and Kato realizes that Japan is crippling itself in its continuous battle with the Allied Forces, making his involvement with Tokyo unnecessary. Thus, with Keiko as his unwilling partner, he concentrates on using his powers to free China and Korea of Japanese control.
In 1945, he is instrumental in the death of Franklin D. Roosevelt. The Japanese government organizes a plan to assassinate Roosevelt through a Buddhist curse cast by abbot Otani Kozui. The Japanese Freemasons politically oppose the plan and attempt to sabotage the project. However Kato assassinates the leader of the Japanese Freemasons, allowing the project to go to completion.
In 1960, Kato returns to Japan amidst the chaos of student protests against the signing of the Treaty of Mutual Cooperation and Security between the United States and Japan. There he befriends the eager young writer Yukio Mishima and subtly manipulates him to promote liberal agendas in the capital which will weaken Japan's political power. Eventually Mishima fights back, and on November 25, 1970; commits seppuku, thereby defeating Katō's influence. Katō retreats into hiding.
In 1998, Katō returns to stir up another earthquake under Tokyo by arousing the water dragon, Ryūjin. It is revealed here that Katō is actually another incarnation of the raging spirit of Taira no Masakado himself who (in the story) had cursed the city of Edo just before his death. Just as Masakado sought to overthrow the current Japanese government, so does Katō seek to overthrow the Imperial authority by eliminating the capital Tokyo. Furthermore, Masakado's curse is revealed to be not just his personal grudge, but the curse of the entire earth.
The final battle occurs amidst the wreckage of the Imperial Capital. Kato and his forces contend with the remaining guardians of Tokyo, which include a resurrected Yukio Mishima and Keiko Tatsumiya's apprentice. After a long struggle, Kato is finally defeated. Thus ends the story of Teito Monogatari.
More about Katō's past is revealed in the spin-off novel Teito Monogatari Iroku. In this novel, it is revealed that Katō is the last descendant in a long line of mystics. Yasunori Katō's predecessor was Jubei Katō, an occultist character featured in Teito Gendan and Shin Teito Monogatari. In Teito Monogatari Iroku, Jubei passes the curse of the grudge against the Japanese Empire down to Yasunori.
In the side story film and novel, Teito Monogatari Gaiden, his disembodied spirit attempts to resurrect itself through the body of a mental hospital nurse in 1995.
Kato also makes an apperance as the main villain of the fantasy novel and film The Great Yokai War. In The Great Yokai War, Katō returns to Japan in 2005 with an army of monstrous Yokai (who have been transformed to serve under his command) in another attempt to destroy Tokyo. This time he is stopped by the efforts of a band of native yokai and a young boy wielding the power of the Kirin Rider. Despite being defeated, Katō survives the encounter and it is implied that at the end, he is still ready to execute another plan.
Powers and abilitiesEdit
Kato's powers are vast and no exact limit has been established on them. Throughout the Teito Monogatari saga and its spin-offs, Kato has demonstrated the ability to levitate, teleport, manipulate objects via telekinesis, dominate the minds of others, summon lesser demons and perform feats of dark magic beyond description. He is also capable of reincarnation, having been killed only to return to life many times.
Kato is a living manifestation of hatred, it is the one emotion that governs his every action. Only persons of significant psychic or spiritual inclination have proven to be any match for him.
- TEITO MONOGATARI was the first novel to popularize onmyodo mysticism in Japanese popular culture. Thus, Kato could be considered the "first modern onmyoji character" in fiction. Likewise, he has gone on to inspire aspects of other modern onmyoji characters such as Subaru Sumeragi and Seichiro of the TOKYO BABYLON and X manga series, and Raidou Kuzunoha of the SHIN MEGAMI TENSEI franchise (see below).
- Some scholars and enthusiasts have referred to Kato as a "Japanese recreation of Dracula". Indeed, it's hard not to notice the parallels between the two literary characters. Both are identified as historical warlords (Dracula as Vllad Tepes and Kato as Taira no Masakado) who are killed in battle only to resurrect several years later as demonic sorcerers. Both learn their magics from mythical schools of the occult (Dracula from Scholomance and Kato from the mythical Abe tribe). Both command animals such as birds, bats and wolves as their familiars. Both require sustenance from human beings (blood for Dracula and human organs for Kato) to fuel their magic and vitality. And of course both prey on young women. Hiroshi Aramata's (the author of TEITO MONOGATARI) personal mentor in college was Hirai Te'iichi, the scholar responsible for translating Bram Stoker's classic novel into Japanese.
- Kato's appearance served as Capcom's inspiration for the appearance of Street Fighter villain, M. Bison.
- Kato was also a primary inspiration for Raidou Kuzunoha, the protagonist of the Shin Megami Tensei: Devil Summoner. Raidou's surname, Kuzunoha, is the mythological mother of the great onmyoji Abe no Seimei, whom Kato claims to be a descendant of.