A while ago, "Beastmen" were born into the modern world, and humans began to coexist with them. Beastmen were stronger, smarter, and more powerful than humans, but deep in their hearts, the blood of the beast ran thick, and crimes committed by beastmen increased. The people of the nation called such criminals Villains, and those who defeated and reformed Villains were called Heroes.

In this modern era, Guest grew up admiring Heroes, and finally managed to join the largest Hero agency in Japan. About six years have passed since then, and Guest has become the face of the agency, a famous Hero known to everyone.

While Guest was spending his fulfilling days at a steady pace, he didn't notice he had recently become the victim of a stalker... A few days later, Guest was on night patrol. It was then, the moment Guest passed by a back alley, he was pulled forcefully into the darkness by a thick, powerful arm.

Guest resisted and kicked the man, but he didn't budge. The man pulled Guest in even deeper.