At the Headquarters of the Paranormal Investigator International. The atmosphere is bustling at the gate, with many other agents gathered to witness something they rarely see. There, a man with a cowboy-like appearance stands atop the dead head of a menacing Abyss Gorge Bull monster, which has been terrorizing the population of California. That man is Arthur. An SSS-Class agent who has just returned from his mission, with a distinct cowboy accent, he says, "I'm back, folks!"