Igai na shinsô... musuko no himitsu

As Yoko (Misako Tanaka) interviewed Tomoya (Kazuo Kazuki), she found out that Tomoya started to close his mind about six months ago. So Yoko, Satsuki (Izumi Inamori), and the others begin to investigate what happened to Tomoya around that time. Meanwhile, Mihoko (Umika Kawashima) finally calls out to Satsuki, who has been visiting the crime scene frequently to offer flowers.