Ichiro Onizuka's retirement as a detective was just around the corner. While working on his final case before his retirement, Ichiro was stabbed and he lost the use of his legs. He has used a wheelchair since the stabbing. One year later, Ichiro is assigned to work at the Shinjuku Higashi Police Station. The police station is always inundated with cases and this causes many cases to be left untouched. Ichiro investigates these untouched cases. Although he is unable to walk, he remembers the city from the Showa and Heisei eras and he visualizes the crime scene with his mind. Detective Keitaro Jin and Saki Toyama, who aspires to become a detective, help Ichiro with the investigations.
