Masayuki Nanjou is the son of Terumasa Nanjo who inherited his father's clinic on Niijima after his death in 1986. Due to his family's sensitivity to Terumasa's death, Masayuki is resentful of the media for its rather flippant depiction of the murder incident on Rokkenjima and prefers to keep quiet about it. He is interrogated by Ange during her own investigation of the incident, only opening up to her as a fellow victim who lost her family.