K revolves around the concept of Kings, individuals with unique supernatural abilities who lead clans. When a Red Clansman is murdered, suspicion falls on an ordinary student named Yashiro Isana.
Hunted by both the Red King's clan seeking revenge and a powerful swordsman loyal to a past King, Yashiro must prove his innocence.
As Yashiro struggles to clear his name, he uncovers a deeper conspiracy, and his very identity comes into question. The escalating conflict threatens to erupt into a full-scale war between the Kings and their clans, with potentially devastating consequences for the world.