On the production of the anime series, the plot of light novels, it was announced April 19, 2010. The premiere was held in April-June 2011. The Opening theme is "Scarlet Ballet" performed May'n, and ending theme is "Camellia no Hitomi" by Aiko Nakano.
Kinji Tohyama, second year student in the investigation section of the Tokyo Butei High School (an institution specialized in training of armed detectives), does not lead a normal teenage life. Boils down to his daily hunt down serial killers. One day he missed his bus and he decides to take his bike.