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In the far future, humans abandon the devastated Earth and move to the upper world "Tenjo". But Tenjo and the law of causation collapse by a war and humans returns to the Earth, which has turns into an inhabitable planet except for Shinshu area. Shinshu is too small to accommodate all the humans, so they duplicate the area and create "Juso Sekai". In order to rebuild Tenjo and the law of causation, the returned humans start reproduction of history from B.C. 10,000. When the reproduction completes until A.D. 1413, a war breaks out in Shinshu and Juso Sekai falls onto the original world. The humans living in Juso Sekai lose their land and invade the original world. People in Shinshu surrender and is divided by the invaders from Juso Sekai. They try to resume the history reproduction from A.D.1457, but the update of history terminates in A.D.1648. A rumor of apocalypse begins to spread around the world.
The story is set in a distant future where Japan is divided into feudal territories and conquered by other countries. There is a floating city named Musashi that is composed of eight ships in the skies. A war that will determine the fate of the world will be fought by students on the Musashi. In the far future, humans abandon the devastated Earth and ascend to the upper world "Tenjo", taking on new, god-like form. But even with their newfound "Godhood", humanity eventually fell into war, resulting in the collapse of Tenjo and the very law of causation, and humanity, having lost their divine powers, returns to the Earth, grown largely uninhabitable, with the exception of a portion of the Far-East (modern-day Japan), which they name "Shinshuu" (Divine States"). As Shinshuu alone is too small to accommodate all of humanity, they duplicate the region in a parallel world they called "Juusou Sekai" (Harmonic Realm"), calling their new territories "Juusou Shinshuu" (Harmonic Divine States). In order to rebuild Tenjo and the law of causation, the returned humans start a reenactment of history, starting from 10,000 BC, following the guidance of historical records from a source known as the "Testament". In the year 1413 TE (Testament Era), the reenactment of the Nanboku-cho War in Shinshuu inadvertently damages the mechanisms separating the worlds, causing Juusou Sekai to collapse into the original world. The humans living in the Juusou Shinshuu thus lost their land, and decide to invade the original world. The people of Shinshuu are defeated, and under the terms of their surrender, their territory is divided by the invaders, and discriminatory laws are imposed on them. Reenactment of history is resumed from 1457AD, but the updates to the Testament unexpectedly end at 1648 AD. A rumor of impending apocalypse begins to spread the world.
60 years before World War II, mankind found ten alternate worlds that exist but with different other physical laws. The force that supports these alternate worlds is called Concept. At the same time, mankind also discovered that all these alternate worlds are about to collide and the ones without the most amount of Concept will be annihilated. To survive, a world call Low-G, which has no Positive Concepts of its own, started the Concept War to try to secure the most amount of Concepts. It took all the other worlds', called Gs, positive concepts and destroyed them all. All that remains is Low-G. Now 60 years later, which is the present, Low-G is facing destruction because of its Negative Concepts are rapidly expanding. To resolve this, Low-G needs Positive Concepts from all the other alternate worlds. UCAT, the team that destroyed the alternate worlds 60 years ago formed the Team Leviathan to begin negotiation with the survivors from all the other worlds. Mikoto Sayama is the protagonist of the story. After his grandpa, who was a key figure in the Concept War and in the negotiation team, passed away, IAI, UCAT's mother branch in Japan, explained everything to Mikoto and had him take over the negotiation seat. Carrying the phrase "The family name Sayama is villain itself" and all the hatred, young Mikoto begins his negotiation with the other worlds.
In the 1990's in the sprawling college town of Tachikawa, Sumiyoshi Izumi was enjoying student life playing 8-bit and 16-bit games at the Gaming Club, when a big-breasted senpai moved in next door. And suddenly they were chosen to be the "human representatives" in the creation of a new alien world? (Source: Kadokawa, translated)
The story is set in a distant future where Japan is divided into feudal territories and conquered by other countries. There is a floating city named Musashi that is composed of eight ships in the skies. A war that will determine the fate of the world will be fought by students on the Musashi. A series of humorous shorts supplementing the Kyoukaisenjou no Horizon anime.
In the heart of Tokyo, a large-scale open-world dungeon phenomenon known as the "Tokyo Great Cavern" has emerged. The protagonist, a Dark Elf with a mysterious past, enrolls in the prestigious Great Cavern Academy, a school dedicated to training elite dungeon conquerors. However, soon after enrolling, the protagonist is attacked by a dragon and finds themselves in grave danger! Just in the nick of time, a red-haired girl named Hanako, wielding a massive hammer, appears on the scene! Circumstances lead the protagonist to join Hanako's conquest unit. But what does it mean when their first timed challenge is "Why don't we just die once and see what happens?" Combining elements of school fantasy, dungeon conquest, and icon talk, "Fantasy Academy!!" is a visually rich novel that incorporates all of Minoru Kawakami's signature elements. The curtain rises on this innovative new novel! (Source: Kadokawa, translated)
The earth is ruled by the Black Witch. The Black Witch was sealed in the moon and can only be judged once a decade on the night of Hexennacht. The ones who can fight the Black Witch are the chosen magical girls who have won their battles. Horinouchi Mitsuru, the Eastern Japan representative who aims to be the strongest, happens across a girl with strange power who says her name is Kagami Kagami. The girls "clash"! To save the world with their own power!!
The earth is ruled by the Black Witch. The Black Witch was sealed in the moon and can only be judged once a decade on the night of Hexennacht. The ones who can fight the Black Witch are the chosen magical girls who have won their battles. Horinouchi Mitsuru, the Eastern Japan representative who aims to be the strongest, happens across a girl with strange power who says her name is Kagami Kagami. The girls "clash"! To save the world with their own power!!
The remains of a pair of men and women who sank to the bottom of the sea. That was one of the consequences of the Kinki upheaval that engulfed the whole of Japan and triggered the division of east and west. It's been 13 years since. The delicate peace, which was maintained between the east and the west, seemed on the verge of collapsing again. IXOLDE, a sacred treasure and strong artefact, was regenerated in the Osaka area. In order to prevent the launch of the artefact, Hidehisa Nakamura, the preseident of the Tokyo area invaded the neutral Nagoya area together with citizens of Zenon City. Why would Osaka regenerate one of the strongest sacred treasures? A new war between east and west Japan begins in Osaka! (Source: KADOKAWA, translated) *Note: Includes 2 extra chapters.*
This side story follows Asama, Kimi and Mitotsudaira aboard Musashi one year before the beginning of the main story, as Asama is considering to create a music band together with her two friends for the next festival in Aki, a territory under the governance of K.P.A. Italia. **Note:** An official comercial release of the side story volumes of Kyoukaisenjou no Horizon that were bundled with the first press release of the 1st, 3rd, 5th and 7th Blu-ray volume of both seasons of anime.