Ghoul, a graffiti artist, makes his way to a local hotspot where artists throw up their tags: a sewer runoff near the river. As he makes his way deeper into the tunnel, looking for a blank canvas, Ghoul soon finds himself in pitch black darkness. While spray painting, he hears a strange croak coming from deep within the tunnel. Trusting his instincts, he ditches his mural and high tails it out of there. Unfortunately, the sewer's twists and turns only get Ghoul more lost within the underground labyrinth, being hunted by something living within.