div class="round8 bubbledRight" style="max-height: 999999px; border-radius: 8px; margin-top: 5px; clear: both; padding: 6px; border: 1px solid #cdcdcd; overflow: auto; background-color: #e1ffa1; font-family: Verdana, Verdana, Arial; font-size: 14px;"Opening Song:br /*Preliator (Globus)*br /br /(0:00)br /br /The scene of Muzan when he was a human was showed, 1,000 years ago, before transforming into a demon, killing multiple people, turning them into demons until he faced Yoriichi and Ki (Keith's ancestor) who barely defeated him before he could attack the Kamado family and he managed to /br /(0:25)br /br /Only when Yoriichi and Ki died, it was insane joy for Muzan because the swordsman and wisteria archer won't stop him to reach his goal of becoming immortal, and then in his ruthless search of immortality, many of his demons killed many innocent victims including Tsutako (Giyuu's sister), Makomo, Sabito and Urokodaki's students killed by the Hand Demon, Kanae killed by Doma who also killed Inosuke's mother, Genya's siblings killed by their mother who was turned into a demon, a demon who killed Yuichiro (Muichiro's twin brother), Muzan killing Tanjiro's mother and his siblings to prevent to another swordsman like Yoriichi appear and also ending Yoriichi's bloodline, even Kyojuro Rengoku succumbing to his wounds and dying, without forgetting that the Upper Moon demons killed many Hashiras across the /br /(1:19)br /br /The scenes of the Hand Demon, Swamp Demon, Yahaba, Susumaru and Kyogai were killed by Tanjiro, in Susumaru's case she was killed by Kibutsuji's curse, with the Hand Demon the deaths of Urokodaki's students were avenged, Rui and Father Spider were killed by Tomioka, Brother Spider was killed by a sleepwalking Zenitsu, Mother Spider was killed by Tanjiro, Sister Spider was killed by Shinobu, later Tanjiro managed to kill /br /(2:12)br /br /The scenes change again, showing the battle of Daki and Gyutaro versus Tanjiro, Zenitsu, Inosuke and Uzui with the four of them defeating the Upper Moon Six, Gyokko was defeated by Muichiro, Hantengu was defeated by /br /However the things weren't over, this is where the heroes from other worlds arrived (MHA OCs), Ultimate Super Smash Bros Squad along with Zodiac Warriors (with improved weapons), Elemental 10, and Ace the Ice Type Hero arrived to the battle, the attacks of demons lowered but the ones of Heartless increased, Keith in his Primal Form used his powers to revive known victims who died at the hands of Muzan or his demons, however they have to relocate them in case that Muzan could threaten to kill the revived /br /(2:42)br /br /A scene shows a furious Muzan who witnessed all the human victims who were revived in his "world", he could see that reviving humans it's a "crime" against the nature, now not only wants to become immortal by eating Nezuko who managed to conquer the sun, also he wants to erase Yoriichi's bloodline forever, kill all the heroes who get in his way to fulfill his goals, punish the Zodiac Warriors and Elemental 10 for their "crime" of reviving humans, and also killing every human of Japan and even the families of the heroes to make sure that no one remembers those who died, definitely Muzan is mentally insane and beyond humanity /br /And for make sure his victory, he met Adam Crowley (from Nightmare Creatures) and turned him into a demon, the Fifth Upper Moon, and he managed to create many hybrid demons, the fire ones have dragon scales and dragon eyes, the water ones are kappa-demons, the wind ones are harpy-demons, the earth ones are golem-demons, the light ones are affinity-demons and accolate-demons (based from enemies in Bayonetta), the dark looking ghost ones are dark-demon, the ice ones are yeti-demons, the wood ones are wendigo-demons, the electric ones are cloudthunder demons, the metal ones are metal /br /And also dark clones of the demons who were defeated previously like Snake Demon, Susamaru, Yahaba, Hand Demon, Swamp Demon, Spider Family, Ubume, Hairo, Kyogai, Kamanue, Rui, Mukago, Wakuraba, Rokuro, Enmu, Gyokko, Hantengu, Daki and Gyutaro, as for the recent Upper Moon Demons they are Kokushibo, Doma, Relvis (hybrid demon made with trainer Silver's blood and replacing Akaza), Nakime, Adam Crowley mentioned previously and Kaigaku, and even a revived Kyogo Shinazugawa who was turned into a demon and was easily convinced in working for /br /The images changed now showing someone saving Jigoro, the Thunder Pillar, from the mysterious demon who is Kaigaku, the images showing the intense training until the night where Ubuyashiki's house exploded, then Tamayo injected the serum which would turn Muzan back into a human, later he was beached by Gyomei but Muzan quickly regenerated his head, the team arrived but all of them fell into the Infinity Castle, they try to reunite but Nakime was separating them by playing her biwa until Capricorn casted a spell which nullified Nakime's /br /(3:32)br /br /The heroes fight against the Upper Blood Demons, common and hybrid demons, even the dark clones, the Darkhand Demon was willing to kill Makomo and Sabito again just like the other dark clones who want revenge like Darkrui, Darkenmu and Darkaza, the team continued fighting and surviving until the scene changed and showing Muzan in his ultimate form holding Tamayo's head before crushing her to death and the King of the Demons killed most of the minor rank Demon Slayers before facing Tanjiro, Caleb, Zodiac Warriors and Elemental 10 /br /(4:04)br /br /Images of the Hashiras who died, unless in the canon universe appeared before showing Caleb with the heroes and including the Hashiras or Pillars, everyone alive, successfully changing their /br /Demon Slayer: Final Battle/div