Magano, a parallel realm filled with monsters known as "Kegare," is a place where exorcists deal with all impurities. Benio Adashino is a prodigy exorcist who is recognized for her strength and is summoned to Tokyo by the Exorcist Union. On her way, she plummets into the arms of Rokuro Enmadou, a young exorcist with a troubled past. But the impurities of Magano do not rest. When these two exorcists witness a couple of children stolen by a Kegare, Benio rushes to save them, dragging Rokuro along with her into Magano. Engaged in a fight she is on the verge of being defeated in, Benio is saved by Rokuro, revealing himself capable of being her rival in talent. Sousei no Onmyouji tells the story of two talented exorcists who are destined to become the "Twin Star Exorcists" and the prophesised parents of the Miko—the reincarnation of Abe no Seimei—who will cleanse the world of all impurities. [Written by MAL Rewrite]

Laia Einburg wants for her father Galia, who is a talented golom maker, and her equally ambitious brother Huey to end a long running feud. But her luck changes for the worse when Lina Inverse and Naga the Serpent save Laia from a rampaging golem. 

(Source: ANN)

In these earlier adventures of Lina Inverse and Naga the Serpent, learn how the two rivals first met. In their first adventure, the two rivals meet and run into a vampire during a rescue mission. Next, Lina is hired to be the bodyguard of a rich man's daughter, Sirene. Lina is at first very enthusiastic about it at first, as she is being paid very well, but Sirene keeps spending all of Lina's first half of pay. (She gets the other half later) She puts together a fake kidnapping to teach Sirene a lesson, but when she really gets kidnapped, she must team up with Naga to save her. In the final episode, Lina and Naga find themselves on seperate sides in a fashion war. (Source: ANN)

The Achiga Girls' Academy in Nara once defeated regional mahjong powerhouse Bansei High School. It advanced into the national team semifinals but lost to the eventual champion, and the mahjong club was later disbanded.

Six years later, elementary school student Shizuno Takakamo befriends transfer student Nodoka Haramura. The two eventually enter Achiga Girls', but Nodoka transfers out of the school in the second year.

When Shizuno sees Nodoka on television the following year as the national middle school individual mahjong champion, she decides to revive Achiga's mahjong club.