September 1998 – February 1999. Nightwalker — The Midnight Detective ( Japanese: ナイトウォーカー真夜中の探偵, Hepburn: Naitouōkā Mayonaka no Tantei) is a late night anime TV series created by Ayana Itsuki that is adapted from a PC-9801 game of the same name. Nightwalker incorporates elements of the horror, detective story.