Prodigy detective Mitsuko Unagi is on the hunt for a notorious serial killer known only as "Eleven". It started ten years earlier, on February 29th 2006, when a series of murders began involving 11 randomly selected victims killed simultaneously in various parts of Tokyo. The killings continued over the next decade, leaving the police with no evidence or witnesses and the killer always one step ahead. But now something is different, and the killer has changed his pattern, giving Detective Unagi the one chance to finally get closer to solving the mystery of the Random 11