In this adaptation of Yuki Masami's manga, Kamiyama plays vampire detective Yukimura Kahi, who looks only 18 years old but is actually 88 years old.Okinaga Kai, who possesses an immortal physique, and Akari Busei, a new employee of the Ministry of Health, Labor and Welfare, join forces to detect a series of murders that have occurred every Christmas for 70 years, and are known as the Sheep Chaser Killer.