The Great Yokai War - Plot

Plot

A young boy named Tadashi Ino moves to a small town after the divorce of his parents. At a local festival, he is picked to be that year's "Kirin Rider," a protector of all things good. He soon discovers that his new title is quite literal, as a nefarious spirit named Yasunori Kato appears. Originally a human who became a demon from the strength of his hatred for humans, Kato desires vengeance against their actions on the Yokai. To carry out his revenge, Kato allies himself with a Yokai named Agi while he summons a fiery spirit called Yomotsumono, composed of the resentment of the many things which mankind has discarded. With Yomotsumono's flames, Kato feeds it Yokai which are used as ingredients in creating violent junkyard Tsukumogami under his control that capture other Yokai to build their numbers while killing humans. One of such Yokai, Sunekosuri, escaped and befriended Tadashi who attempts to obtain the Daitenguken from the mountain as part of being the Kirin Rider. However, he wimped out at the last second and with trickery by Shōjō, who picked Tadashi out, the boy overcame the test. Accompanied by Shōjō, Kawahime, and Kawataro, Tadashi makes his way to the DaiTengu who gives him a sword before being taken away by the Tsukumogami. In spite of Tadashi's attempts, the sword is broken as Agi takes Sunekosuri as her captive before the boy is knocked unconscious.

When the boy comes to his senses, he finds himself among Yokai as they discuss how to fix the sword, deciding to get the aid of the blacksmith Ippon-datara. But learning he was also captured, General Nurarihyon and his group leave; Kawataro restrains an Ittan-momen while praising Azukiarai, unaware that he only remained behind due to his foot getting numb. When Kato's industrial fortress takes flight towards Tokyo, Tadashi and company pursue it and arrive after the fortress ingested Tokyo's Shinjuku Capital Building, finding Ippon-datara who reforges the sword while avoiding to talk about how he escaped thanks to Sunekosuri who took his place in becoming a Tsukumogami. Donning new attire, Tadashi and company are outnumbered until they receive unlikely aid from thousands of Yokai who believe they are coming to a party; their festival brawl with Tsukumogami allows Tadashi and Kawahime to enter the fortress safely, followed by a Yokai-obsessed reporter named Sata whom Kawahime saved in the past.

Forced to slay the Tsukumogami that Sunekosuri became, restored to normal yet hanging on for dear life, Tadashi battles Agi in rage before she is called back by Kato to begin the final phase by joining with Yomotsumono. Despite Tadashi's attempts, Kato proves to be superior as Kawahime attempts to protect the boy, admitting to her hatred for humans for being abandoned when she first came into being, but will never resort to a human emotion - revenge. Unfazed, Kato takes the two out as Azukiarai awkwardly arrives and the villain calls Agi to join him. However, her love for him is a hindrance to the process, so Kato kills her instead before entering the oven to become one with Yomotsumono. However, due to Sata's actions, one of Azukiarai's Azuki beans ends up in the mix with Kato, causing a chain reaction of positive emotion that destroys Yomotsumono. After the Yokai take their leave, Tadashi and Sata find themselves on the street and the boy tells his first white lie to the reporter about Kawahime's feelings towards him. Years later, Tadashi is a grown man who lost the ability to see Youkai, even Sunekosuri who is at the end confronted by an Azuki-pupiled Kato.