Owari no Kakera is an original story taking place one month prior to the beginning of the original game. It is told mainly from Akihiko Sanada's perspective beginning with him seeing a mysterious humanoid-shaped Shadow while exploring the Tartarus together with Mitsuru Kirijo. (Source: Megami Tensei Wikia)

In modern day Japan, humans with "divine power" are called "Himiko," and once receiving national certification, they are called "Kamisama" or "God." After Nagi's grandmother passes away, the shrine in her hometown no longer has a god and is in trouble. Nagi's twin brother, Takeru, inherited divine power but unfortunately is a hikikomori or shut-in. By chance, Nagi enrols in "Kamisama Gakkou," the school where Himiko attend. Compelled to revive the shrine, Nagi aims to receive national qualification and become a god.

Berta’s marriage was suddenly arranged, she will become the second consort of the King. The current royal family values lineage above all else, with several generations of consanguineous marriages, to preserve its “purity.” The politics of the Kingdom, following the idea of the pureblood noblemen’s superiority, caused national power to decline. To retain the power of the Kingdom, the Royal Family decided to take a desperate measure, a marriage with a woman from the ethnic group to which belongs the majority of the population. The bitterness of this act… Those who were previously considered a subjugated group of people living on the frontiers. The chosen bride is Berta, the first daughter of the current lord of Kasha, the largest estate on the frontier and also a powerful faction. The marriage life started in hard mode, a husband that doesn’t love her, a Queen that hates her, however, she still is forced to fulfil her role duties. Berta has decided to endure the hardship, that was already expected by her, and wait for the day when there’s no more need of her in the palace, and she can return home. However, Berta’s initial plans are ruined by an unexpected situation. After passing three nights with the King, as the royal rules dictated for a newlywed bride, Berta got pregnant with His Majesty’s child!!

Another world exists one level below the one we live in, the Rengoku. Rengoku is filled with a poisonous gas called "ren". Although "ren" is harmful to the human body, it brought many new possibilities to mankind. Artemisia also known as Alto is the first princess of the country Ei. She has an abnormal body which is a doorway connected to the Rengoku. Because of this her body emits "ren" uncontrollably, bringing death to the people around her. As a cursed princess, she is locked up in the castle's dungeon, living her life without daylight. One day Alto met a young knight named Fog and together they received an order from the royalty. Alto's goal is to become a "Rengokushi", controlling the exceptional power that "ren" brings. "Come, let us dance in the sorrowful Rengoku!"

A story about giving birth, not giving birth, and not being able to give birth.

Originally, it was a martial arts manga that mixed fiction and non-fiction, in which the main character, Ushio Akaboshi, a karate fighter, went to America in pursuit of his missing brother. There he witnessed the strength and variety of martial arts in America, and he set out to defeat Benny Youkide, the man who defeated his brother. The manga was a documentary-style work with a mixture of reality and fiction, involving not only martial arts but also Kyokushin Karate led by Oyama Baidatsu, New Japan Pro-Wrestling led by Antonio Inoki, and new martial arts led by Kurosaki Kentoki. (Source: Wikipedia Japan, translated)

A life story of one of the most popular mangaka, Fujiko F. Fujio from the perspective of Shintaro Mugiwara, his former assistant.

What was left for the boy, was just the girl. And what the girl chose, was just the boy. Human siblings living in a remote village, elven siblings living deep in the forest. The peace of theirs, who should not have been friends, should have continued forever. However, when the elves suddenly started an invasion on the human world, the feelings of the four were torn apart and they took different paths. Eventually, the human boy Imina and the elf girl Ellis stood on the battlefield. The sword he holds is crimson. The same color that had flowed on it, and will flow on it from then onwards... The sharp, blood-colored dark fantasy begins here! (Source: Kadokawa, translated)