In Japan, there exists a government agency known as the Supernatural Disaster Countermeasures Division (SDCD), whose duty is to protect the citizens from creatures unseen. They are able to dispatch these monsters swiftly and without alerting the general public. But currently, they face a different challenge: the betrayal of one of their own. After the death of her mother several years ago, Kagura Tsuchimiya has been fostered by the Isayama family and forms a close sister-like bond with their daughter Yomi. The two become inseparable, and together they work for the SDCD as highly skilled exorcists. However, as the stress and consequences of their sacred duty weigh on them both, and family politics come into play, Kagura and Yomi begin to slowly drift apart. One of them grows earnestly into her role as an exorcist, and the other heads down a dark path from which there may be no redemption...

Daisuke Kanbe, a man of extraordinary wealth, is assigned to the Modern Crime Prevention Headquarters as a detective. It is there that he gets partnered with Haru Katou, a humane detective who values justice above all. The two are polar opposites, and their morals clash time and time again. Haru despises Daisuke for using monetary wealth to solve cases, as he believes that money isn't everything. The two will have to combine their efforts, however, to solve the mysteries that are coming their way. [Written by MAL Rewrite]

Tensions are running high among the clans as the Green King begins making moves that threaten to drive the world into pandemonium. Following the death of the Gold King, the safety of the Dresden Slate, the source of power of the Kings, is under threat. Nagare Hisui, the sly and mysterious leader of the Green Clan Jungle, is determined to procure the powerful Slate by any means possible. Standing directly in his way is Sceptre 4, the Blue Clan, headed by their unyielding King, Reisi Munakata. However, the grim sight of his crumbling Sword of Damocles leaves the stability of his clan and all of Japan in jeopardy. Meanwhile, still recovering from their tragic losses, Anna Kushina and her aggressive clan HOMRA find themselves caught up in the Green King’s games. Amidst the chaos, Kurou Yatogami and Neko are left vulnerable while their beloved friend, Yashiro Isana, the Silver King, remains missing. K: Return of Kings tells the struggle of the remaining clans against the Green King’s formidable forces as one final king appears. [Written by MAL Rewrite]

While visiting the National Library, junior-high students Miaka Yuuki and Yui Hongo are transported into the world of a mysterious book set in ancient China, "The Universe of The Four Gods." Miaka suddenly finds herself with the responsibility of being the priestess of Suzaku, and must find all of her celestial warriors for the purpose of summoning Suzaku for three wishes; however, the enemy nation of the god Seiryuu has manipulated Yui into becoming the priestess of Seiryuu. As enemies, the former best friends begin their long struggle to summon their respective gods and obtain their wishes... [Written by MAL Rewrite]