| Spoiler warning!|
This article contains plot details about an upcoming episode.
|Anime||1997 Series Episode 1 School's Seven Mysteries Murder Case|
Ryozo is Chihiro Aoyama’s father. Ten years ago, Chihiro suddenly disappeared, and Ryozo was in disbelief. He refused to accept that his daughter would just disappear for no reason. Years later, he would find out that his daughter died due to an accidental fall from a staircase, and her bones had been hidden in a wall. Ryozo would also become the murderer of Yuichiro Matoba.