Tokyo Ghoul: JailEdit
The Jail incident - the ghoul Jail committed the crime of mass-killing investigators. But there were few eye witnesses, and no one knew his true appearance.
As one of the suspects of the Jail incident, Rio was falsely charged with the crime and imprisoned in Cochlea.
During the 11th Ward Battle, Aogiri attacked Cochlea, and Rio took advantage of the commotion and broke out of Cochlea. Worn out, he wandered the town and was given a warm welcome at Anteiku. He began searching for clues on Jail who was the cause for his imprisonment.
After having caught hold of some information on Jail, Rio approaches the ward that he believed to be Jail's turf. There, he encounters Kaneki, who is eating powerful ghouls and seeking to become stronger. Since they share the goal of chasing Jail, they decide to act together.