Raging Newspaper Reporter

(from ebookjapan):

Fumiya Saotome, the "Raging Newspaper Reporter" of Akatsuki Newspaper, has been transferred to the archives and is currently working under house arrest.

Then a homeless man is murdered. Bunya assists a junior reporter, Hikaru, and continues to investigate the case in secret. While other companies report that a former boxer committed the crime, Fumiya independently identifies a suspect!