Ryūji Kimura is Kariage's direct manager at Honnyara Industries. He frequently clashes with and disciplines the protagonist over workplace conflicts. Kimura exhibits a consistently short-tempered and stern demeanor, often reacting to Kariage's actions or misunderstandings with visible anger.

As Kariage's supervisor, Kimura embodies organizational authority, enforcing workplace norms and addressing Kariage's behavior through reprimands and direct orders. Their professional relationship forms a recurring dynamic centered entirely on disciplinary interactions within the office environment.