On the day of entrance exam someone helps Narumi by giving her a pencil. She wants to thank him but he's soon gone. She couldn't forget her hero so she hopes to see him again. While looking around the campus she hears the sound of the piano and enters a room where other four freshmen are present. Here she'll meet Seika, Tamotsu, Osamu and Junichiro. Together they decide to form the Asunaro Club.

In the year 2500, the earth has been taken over and covered in darkness by a race known as the Neo-Descal. The remaining members of the human resistance send their trump card weapons, the three Meteor God warships to the past to try to change the future by stopping Neo-Descal in 2005, when their attacks began. Along with the Meteor God warships comes Ad, captain of the Adle-Eagle squad and his right hand man, Gordo, Kane, captain of the Beet-Vizor squad, and the twin Sazers Ein and Zwein, and Remy, who pilots Great Lio. Ad and Kane are joined by Takuto Andou, whose grandfather met Captain Shark, leader of the resistance, as a young man and was left with a Knuckle Cross to allow his grandson in 2005 to become the third member of the team known as Sazer X. Sazer X fight the space pirates known as Descal, and later Neo-Descal when they arrive from the future after the defeat of their ancestors. Captain Shark, known as the Shark Sazer, arrives later from the future, along with his rival, Jackall, a mysterious Sazer-like being who holds one of Shark's greatest secrets.

Nicholas and Amara have a son named Itsara, and are expecting twin girls named Ornchuma and Inthira. As Amara is nearing her due date, they are visited by aunt Helen. She reminds Nicholas that the birth of a female child into their family will bring upon a horrible fate, as their family is cursed. Helen tries to kill the twins the night they are born, but fails. When the twins turn six, Inthira, the younger twin is angered to the point of becoming Medusa. She kills one of the servants in the house. Nicholas takes Inthira to Greece, in attempts to find a cure for the curse. Left behind are Amara, Itsara and Ornchuma.

20 years later, Nicholas dies abruptly and Inthira is forced to return home. While Ornchuma and Itsara welcome their younger sister, her mother is not happy with her return. Will Inthira be able to suppress her inner monster?

The story revolves around the adventures of the protagonist Di Yun, an ordinary young peasant, who is imprisoned after being framed. In his quest for vengeance, he accidentally acquires the Liancheng Swordplay manual, an ancient artifact not only prized for the skills detailed inside, but also for containing a secret leading to a treasure.

Adapted from a novel by Jing Yong.

20 years ago a half-frozen boy was rescuded in the mountains after his parents apparent sucide. He gets released from a mental institution and his girlfriend notices him talking about a dark mountain shadow. Meanwhile a murder happens in a residential area in Tokyo. Assistant Inspector Goda Yuichiro takes on the investigation. Soon an official of the Ministery of Justice gets murdered in a similar fashion pointing towards a serial killer. Yet, Goda receives a strange order from above: he's not to further investigate in this direction. He senses a huge mystery behind the case and starts chasing after the psychopath killer called Marks. Somehow a journalist's research about a corrupt construction magnate and another unsolved murder that happend in the mountains 13 years ago are also linked to the case.

A man named Soichi Tsugami has lost his memories. He doesn't know who he is, where he came from, or how he came upon his peculiar circumstances. Tsugami, seemingly for no reason, transforms into a powerful superhuman, Agito, whenever in the presence of the beings referred by the police as the "Unknown", a race of powerful monsters that have been causing murders around Tokyo, targeting certain people as their prey. In response, the police department unleash their newest weapon: the G3 powersuit, originally developed to fight against the "Unidentified Lifeforms", the enemies of No.4 (Kamen Rider Kuuga). G3 and Agito don't know whether they should join up and defeat the Unknowns, their common enemy, or to combat each other, keeping the mysteries that entwine them separate. Ultimately, even more mysteries unfold, with the appearance of Kamen Rider Gills, who is on a search to uncover why his father committed suicide. These mysteries and others collide, as the true nature of Agito would ultimately determine the fate of humanity.

The series featured many firsts for the franchise, including the start of the story in a movie rather than the series proper. Ultraman Cosmos: The First Contact was the prequel to the series and took place ten years before episode 1. In it, 9-year-old Musashi Haruno encounters the being of light, Ultraman Cosmos, and befriends him as the two confront a threat to Earth.

Ten years later, Musashi, now 19 and a member of Team EYES, once again encounters the being of light from his childhood. The dark being Chaos Header has appeared and is corrupting the monsters of Earth, making them become ravenous and violent creatures that threaten humanity. Through Musashi's will to see the beasts and humans live in peace, Cosmos grants him a new power that will allow him to heal the corrupted creatures.