"K: Return of Kings" is a Japanese anime series that serves as a sequel to the original series, K. It follows the ongoing conflict between various clans, particularly focusing on the Kings and their respective Colorless and Color clans. The story delves into themes of loyalty, power struggles, and the consequences of past actions. The series features returning characters like Shiro and Kuro, as well as new ones who add depth to the narrative. The animation is notable for its vibrant visuals and dynamic action sequences, enhancing the overall experience for viewers.