Intro. Akira Nikaido finds himself fighting a kokuchi, creatures from the shadow world that possess and corrupt humans. This time, the kokuchi has taken control of the body of an innocent man, which complicates Akira's fight as he must try to defeat the enemy without harming the host. Meanwhile, Shirogane, the mysterious and elegant being from the shadow world, watches from the shadows. Although he always maintains his calm demeanor and prefers Akira to learn to solve situations on his own, he can't help but be on the alert in case something goes wrong. Shirogane shares a deep bond with Akira, as the latter is essential to maintaining the balance between both worlds. In the midst of combat, Akira, with his typical impulsive and brave attitude, decides to take a risk to end the fight, but is unexpectedly stabbed in the chest by the possessed host. Shirogane immediately intervenes.