Kimihiro Watanuki can see spirits and other assorted supernatural creatures, which is quite a bothersome ability he strongly dislikes. On the way home one day, while plagued by some spirits, he is inexplicably compelled to enter a strange house. There, he encounters Yuuko, a mysterious woman who claims to be able to rid him of the ability to see and attract the troublesome creatures—for a price. She demands that he work at her "store" that grants wishes to people, and thus begins Watanuki's adventures through weird and wonderful events. [Written by MAL Rewrite]

In 18th century Paris, a coffin is found floating down the Seine River. It carries the corpse of noblewoman Lia de Beaumont: a spy of King Louis XV, and whose younger brother D'Eon has just been knighted. When several disappearances occur throughout Paris, the young knight believes that they are somehow connected to his sister's death. Hoping to find her killers, D'Eon joins the secret police to investigate the incidents. Following the clues, they piece together that a conspiracy between members of the French and Russian nobility, spurred on by a cult, may be behind the disappearances. D'Eon concludes that Lia may have uncovered the truth while on a mission and was killed as a result. That night, the secret police are to arrest the Duke of Orléans on suspicion of being the mastermind. One of their own transforms into a demon called a Gargoyle and massacres the group. D'Eon attempts to rescue the sole survivor, only to find that he too has been transformed. During the ensuing battle, D'Eon is possessed by Lia's vengeful soul, who takes command of his body and slays the Gargoyle herself. In the aftermath, D'Eon must gather allies to discover the depth of this supernatural conspiracy. [Written by MAL Rewrite]

In the molecular biology department of a major university, Komada and Koshigaya do more than just teach. They are also investigating demon viruses, which cause people to morph into grotesque creatures with a craving for human flesh. While conducting their research, the pair encounter Sayaka Murakami, the granddaughter of a famous fortune teller. Feeling compelled to help her find her missing grandfather, Komada and Koshigaya learn that a group of thugs is pursuing Sayaka. To make matters more sinister, these perpetrators seem to have a connection to the demon viruses. [Written by MAL Rewrite]

Christopher "Chris" Senshuu is an easygoing guy who keeps failing his college entrance exams well into his mid-twenties. His days are occupied with Kendo practice, visits to his family's shrine, and dreaming of his high school reunion. When his spirit is suddenly transported to the world of Byston Well, Chris becomes Garzey's Wing, a legendary holy warrior. The Metomeus tribe summoned him to help liberate them from slavery, but unfortunately, Chris has no knowledge on how to be a holy warrior, and moreover, only has an incredibly dull sword which he salvaged from a corpse. To make matters more complicated, there is another Chris who is still in the normal world! He cannot control the events in Byston Well, but is tied to the fate of the other Chris. The young man must struggle and adventure in a world of magical creatures and mysterious foreigners. [Written by MAL Rewrite]