During the US occupation of Japan, she and several accomplices are believed to have murdered dozens of infants, a crime spree known as the Kotobuki San'in incident.

Miyuki Ishikawa (née Omaru or Komaru (小丸)[5][6]) was born in the village of Honjō in Miyazaki Prefecture.

[10] Miyuki was an experienced midwife, and managed a maternity home named Kotobuki San'in (寿産院 / 壽產院), holding some important positions of multiple midwives associations.

Due to a decrease in foster parents, Ishikawa chose to neglect numerous infants, many of whom died as a direct result.

[14] Public Health and Welfare Section (PHW) at GHQ/SCAP and Tokyo-Kanagawa Military Government District (TKMGD) also dispatched some officers to the site.

[21][22] Moreover, it was revealed that the other eleven maternity homes in Tokyo had also committed crimes similar to Kotobuki San'in case by the end of 1948.

[23] Several intellectuals, such as doctor Takashi Hayashi (林髞) (Takatarō Kigi (木々高太郎)) and politician Tamayo Miyagi, advocated that Japanese government should begin to consider the legalisation of abortion in Japan in order to prevent recurrence of such incidents.

At the time of the interview, Takeshi was already dead and Ishikawa was operating a real estate office in Tokyo, and she boasted about having built a big tomb for herself two years before.