Chief Inspector Hayashi Teruo is short-tempered, impatient and a perfectionist. When another one of his partners resigns, Teruo is assigned a new one transferred from Hiroshima. But this comes with a condition: if his partner bails on Teruo before the end of the month, he risks demotion.
Miyazaki Shinji wants to forget the problems of his past, focus on his new position at Tōkyō MPD and work with the department's best homicide detective. As a supernatural, Shinji speaks with ghosts of murder victims, gaining insight into the cases and solving them faster.
Before they get a chance to become acquainted, Teruo and Shinji are thrown into a new murder case. The body of a young man is found, killed with a weapon bearing a strange resemblance to a dog's collar. As more victims are discovered, they need to dig deeper and find the connection between them.
While working on the case, Teruo and Shinji are caught into an irresistible attraction. But being partners on duty and lovers in bed isn't easy. As Teruo slowly unravels Shinji's secrets, he questions his partner's integrity, while Shinji is caught in endless lies threatening his relationship with Teruo as lovers and coworkers.
The Red Collar is a gay spicy detective romance with a paranormal twist. It's Book 1 in the series and features a happy ending. The book contains themes meant for mature audiences only.