Ruka Mikazuki
About
Someone who later works with Makoto and Yukiko to escape the city and the Managers.
It is later revealed he works with the managers in exchange to regain memories of his old life via shortcake. He is ranked one level above them as an expert.
He meets with Yukiko and Makoto (having retained their memories) at the end of the story from a youth detention center, implying in the "real" world he was a criminal.