(秋月 四帆 '''Akizuki Shiho''') : Shiho is a supporting character of the fourth mystery, she is the 4th child of the Akizuki Family. Lately there have been a set of killings by someone known as the "Slasher", which is believed to be by her older brother. She refuses to believe that her brother is the killer, and closely helps Sakon figure out who the real murderer.
Shiho reappears in the 8th mystery, to help support Sakon with his involvement with the puppet theater.
Shiho is a bit of a tomboy; she was closest to her brother, so she will do whatever it takes to prove he is innocent.