Mahokaru Numata (沼田まほかる, Numata Mahokaru, born 1948) is a Japanese crime fiction and horror writer. There has been an iyamisu (eww mystery) boom in Japan since around 2012. Iyamisu (eww mystery) is a subgenre of mystery fiction which deals with grisly episodes and the dark side of human nature. Readers blurt out "eww" when they are reading iyamisu (eww mystery) novels. Mahokaru Numata, Kanae Minato and are regarded as representatives of the genre in Japan.