Karin Nanase is a significant character from the series 'Kyokou Suiri' or 'In/Spectre.' Known as the 'Steel Lady Nanase,' she is a mysterious, ghostly apparition that terrorizes the city. In life, Karin was an idol with a tragic past, and her unresolved feelings and rumors after her death contribute to her haunting presence. As a key figure in the narrative, her legend becomes a central challenge for the protagonists to unravel, blending elements of supernatural mystery with the personal struggles of dealing with fame and its aftermath.