Since he was young, Chiwa has been dreaming of returning to the Underground. He finally succeeded by joining the Special Forces unit of the police.
"Great Raven" is made up of mostly Enhanced Humans who have unique abilities. Their mission is to track down members of the crime syndicate, Joker, and stop it from kidnapping and altering children's bodies. But Chiwa is completely unprepared for the things he finds in the Underground.
