"Kings" are individuals who have been bestowed with incredible supernatural powers and granted the ability to recruit others into their clans. Protecting the lives and honor of their clansmen is an integral part of the Kings' duties. After a video depicting the heinous murder of a Red Clansman spreads virally, the unassuming student Yashiro Isana is accused of homicide. Now, a manhunt is underway for his head, bringing him into contact with the infamous "Black Dog" Kurou Yatogami—a skilled swordsman and martial artist determined to follow the wishes of his late master, the Seventh King. Meanwhile, the current Red King, Mikoto Suou, faces his own imminent demise as the search for Yashiro narrows. But during Yashiro's struggle to prove his innocence, a greater conspiracy is unraveling behind the scenes; clouds begin to appear in his memory, and close friends start to question his very existence. What began as a simple murder is now leading towards a full blown war between Kings with the very fate of the world at stake. [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]

In the distant future, humanity has taken to the skies and colonized many planets throughout the universe. An agency known as the Galactic Organization of Trade and Tariffs (GOTT) has been formed to maintain order. Within GOTT, a secret squad of enhanced human beings—known as the ES Unit—carry out secret missions to put a stop to major galactic crimes. Two such operatives are the lowly C-ranked Éclair and Lumière. Despite being on the bottom of the totem pole, the pair wield formidable powers: Éclair's superhuman strength and lipstick whip and Lumière's ability to take control of any computer. Together, they can take on any mission that GOTT throws at them. But as they complete more and more missions, the duo begin to uncover a major conspiracy that leaves them questioning everything they know about themselves and the entire galaxy. [Written by MAL Rewrite]

Twenty-five years after Éclair and Lumière, (from the flagship Kiddy Grade series), rescued the galaxy from destruction's doorstep, the GTO (Galactic Trade Organization), created after the defeat of the GOTT (Galactic Organization of Trade and Tariffs), act on behalf of universal peace by combating criminal activity. Their special ES division mirrored after the GOTT's ES (Encounter of Shadow-work) force, now includes publicly acknowledged ES member candidates. The series follows two such trainees, Ascoeur and Q-feuille, as they work their way to ES membership. (Source: Wikipedia)