Kyōsuke Karami, known as K.K., operates as a Walking Arsenal. He traverses the universe with Muscat Tyler, the 108th prince of the Galaxy Empire, and Lu, a member of the Light Wing Race considered the universe's strongest creature. Conflict inevitably emerges wherever they journey. K.K.'s designation as a Walking Arsenal suggests a focus on combat readiness or advanced weapon deployment. His association with Prince Muscat Tyler places him within a dynamic involving galactic nobility and extraordinary beings. Their collective presence sparks the resolution of interstellar disputes and unforeseen challenges encountered during their travels.