A pact between humans and the demons from the dark realm has existed for hundreds of years. This pact has forbidden any aggression between the two sides. Without this agreement, the human world would have long been destroyed. Now, just at the turn of the twenty-first century, this pact must be renewed in order to keep the peace. One man, the legendary Dr. Joseppe Maiyart, is necessary to extend the length of this treaty. He is the only one able to do so. But, terrorists from the human world as well as the dark realm aim to prevent this man from extending this treaty. Two high officials from the Black Guard, a group of undercover agents who protect this pact, have been chosen to protect the doctor on his journey to the site of the treaty signing in Tokyo. These two guards hold humanity in their hands and risk their lives to protect it from the clutches of evil. Making it an even harder task for the two, the doctor constantly gets into trouble of his own.

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