Kadokawa Niconico Ace

The year is 2199. The once blue and green planet Earth has been reduced to a radioactive desert wasteland by constant attacks by the hostile aliens from the planet Gamilus which force the remaining population underground. However, a friendly alien race from the planet Iscandar contacts the humans and gives them the blueprints to build a powerful space battleship capable of retrieving a device to clean the planet before humanity disappears. The United Nations Cosmo Navy—whose space fleets have been decimated by Gamilas forces—resurrects the long-sunken battleship Yamato and applies the alien technology to its interior, transforming it into the vessel for which the series is named: Space Battleship Yamato. (Source: Wikipedia)

The Western Planet and the Eastern Planet. Once upon a time, the two sides were bound by the "Dragon Pulse" spanning the heavens. The civilization that once had prospered has now turned to a tale of dreams, as the inextinguishable flames of war tear the realm asunder. The two planets remain engulfed in endless battles. The return of the super technology known as "sacred treasures" could revolutionize the world order, but no one knows of them but one person—a "heretical girl." A girl from the Western Planet, Jeanne Kaguya d'Arc, saw heavenly visions of the birth of a "Star Messiah" who will save the world. She embarks on a journey to the Eastern Planet with Leonardo da Vinci, "the one who observes the world." They come across the heretic of the Eastern Planet and "the greatest fool of the day," Oda Nobunaga. (Source: ANN)

One day, an ordinary high-school girl named Minase Youmu is kidnapped up in the mountains. Her kidnappers claim that she has taken some kind of "medicine" and that there's no going back. Luckily, though, a former detective named Sanpouji Kotetsu happens to pass by where she is being held, and rescues her. Kotetsu hastily gets the underage girl to the police, where the investigator Naru Asuka and her 'psychic' partner Hayama Reiichi take on the girl's case. Asuka, Reiichi and Kotetsu have to figure out who took Youmu--and what was done to her--before it's too late (if it isn't already)! (Source: MangaHelpers)

In the latter half of 21st century, humans leave the Earth and begin to live in space. In order to adapt to the environment in space and deal with the hostile aliens in Jupiter, genetically engineered children called "Princes" are artificially raised and trained to be pilots of armed robots "AHSMB (Advanced High Standard Multipurpose Battle Device). This is a story about one of the teenage "Princes," Hitachi O Izuru, who studies in an academic city Grandzehle. (Source: MAL)

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The manga is set in a world where monsters who can devour humans lurk hidden in modern society. The only ones with the power to eliminate them are called "Dragon Knights." The story focuses on Hyra, the youngest Dragon Knight, and the unit that he commands as he goes on missions to eliminate these monsters. (Source: ANN)

A middle school student gets kidnapped and wakes up in a school with no way out. He has to participate in a battle royale with the other students in order to survive.