Miyuki Ishikawa
Miyuki Ishikawa (February 5, 1897 - May 30, 1987) was a Japanese midwife and serial killer who is believed to have murdered many infants with the aid of several accomplices throughout the 1940s.
It is estimated that her victims numbered between 85 to 169, however the general estimate is 5. When she was finally apprehended, the Tokyo High Court's four-year sentence she received was remarkably light considering that Miyuki's actions resulted in a death toll so high that it remains unrivaled by any other serial killer in Japan. According to a report of Children's Rainbow Center, writer Kenji Yamamoto referred to the incident as "unbelievable and unbearable."