Ran Ninomiya, a detective belonging to the Special Missions Division of the Metropolitan Police Department! Contrary to his cute eyes, he continues to challenge evil today... 8 years ago - Ran and his friends go out with his parents without getting wet, and they encounter a bank robbery right in front of them. His father, a detective, and his mother, a female police officer, were shot and killed with pistols, and the criminal, Sakata, was arrested. However, Sakata escaped from prison. Ran burns with revenge, but there is a hidden side to the incident eight years ago...! A collaboration between one of the most talented original authors in the manga world and a cute girl character who took the world by storm with her romantic comedy.