In the series, Hisui Jozuka (played by Kaya Kiyohara) has a special ability that allows her to identify people who committed murder, and she can hear spirits. But she can't tell the police or have it use as evidence because no one will believe her. Living a lonely life because of her abilities, she meets mystery writer Shiro Kozuki (played by Koji Seto), who helps the police solve cases. The duo started working together to solve cases.
[Additional info from AsianWiki]