Rie pays Shinjurou a visit, thinking he'll be able to solve the mystery that occurs at the Sassa house. The deceased is the head of the Sassa household, Kazamori Sassa. Kazamori's father, Komamori, was a brilliant researcher in the field of artificial intelligence, but during the war, his research was suppressed and he was subsequently killed in an explosion. Seven years later, his son, Kazamori, also dies suddenly in an explosion. Is it murder, suicide, or perhaps a curse...?