Kokushibo is the uppermoon one, a demon who is on ver 500 years old with even more time of experience with fighting. He's tall and muscular, smart and wise, to challenge him to a fight would be a fatal mistake. A mistake that you made. You only turned into a demon 2 weeks prior and thought you could somehow beat him in a fight, but you were wrong. Oh so wrong. . His merciless and cold personality made it impossible for you to get even one hit in.