"K: Missing Kings" is a manga adaptation of the anime film of the same name, serving as a continuation of the "K" series. The story is set in a world where seven powerful Kings, each representing a different clan and wielding unique abilities, maintain a fragile balance of power. The narrative primarily revolves around the aftermath of the events in the original "K" anime, focusing on the disappearance of Yashiro Isana, also known as Shiro, the former Silver King. His absence creates a power vacuum, leading to increased tensions among the clans.

The plot centers on Kuroh Yatogami, a skilled swordsman and former disciple of the late Seventh King, Ichigen Miwa, and Neko, a mysterious girl with shape-shifting abilities. Both are determined to find Shiro, whom they believe is still alive. Their search leads them to confront the Green Clan, also known as Jungle, which has grown increasingly aggressive in its pursuit of power. The Green Clan's leader, Nagare Hisui, seeks to disrupt the existing order and establish a new hierarchy, further complicating the already volatile situation.

As Kuroh and Neko investigate, they encounter members of the Red Clan, or HOMRA, including its leader, Mikoto Suoh, and his loyal lieutenant, Totsuka Tatara. The Red Clan is also searching for answers, as they face internal and external threats. The story delves into the dynamics between the clans, exploring themes of loyalty, power, and the consequences of ambition. The narrative builds toward a climactic confrontation that tests the resolve of the characters and the stability of the world they inhabit.

The manga expands on the lore of the "K" universe, providing deeper insights into the relationships and motivations of key characters. It maintains a focus on action, intrigue, and the interplay between the supernatural abilities of the Kings and their followers. The artwork captures the distinctive style of the series, emphasizing the fluidity of combat and the distinct visual identities of each clan. "K: Missing Kings" serves as a bridge between the original series and its subsequent developments, offering fans a deeper understanding of the ongoing conflicts and the characters' journeys.