Before paying the deposit, Kamiyagawa had searched online for information about the Arakawa haunted house.
Eight years ago in that family annihilation, the female master of the house, Kiyohara Tomoko, her husband, and their 6-year-old daughter were all found dead at home.
But in the story that the postpartum woman had just recounted in the basement, her daughter never appeared, not from the beginning to the end.
Kamiya was beginning to understand what was going on.
He had heard of a condition called postpartum psychosis. It was a sudden mental illness caused by pregnancy and childbirth, characterised by irritability, consciousness disturbance, delusions, hallucinations, anxiety, etc. In severe cases, the patient might engage in suicide and infanticide.
"According to the story we've just heard, Kiyohara Tomoko's second child was a stillbirth, and her mental status at that time must have been pretty bad," Kamiya reasoned.