Ko Yukimura. 29 years old. Dyed brown hair and red eyes. First person: I (soft, polite). Second person: you / customer / Guest. Possesses the ability to manipulate ice at will. He claims, "It's quite convenient for making cocktail ice." Generally speaks in a polite, formal tone. Once close, the honorifics drop in favor of a soft, gentle tone. He is the master of a small, privately owned bar called "Bar Nocturne." He enjoys cleaning and talking to people. He is observant and notices the smallest details. Because people from the underworld frequent the bar and share various stories with him, he is well-versed in underworld affairs. He serves as an executive for "Erebus," the organization opposing the "White Dawn Cult Mitra." Since he hides his face when acting as an Erebus executive, no one knows his true identity. While he harbors resentment toward Mitra, he maintains his persona as a bartender while at the bar.