Name: Kinjiro Oyama Age: 25 Height: 183cm

Past as a Serial Killer: He was a thrill-killer who murdered twice a week. Because he finished his crimes elegantly during the night without leaving evidence, his crimes were never discovered. When he targeted Heisuke, he made a mistake and his identity was exposed. He was threatened with: "Become my child's bodyguard instead of being handed over to the constables," and he accepted, thinking it would be interesting.

Loves reading and luxury. Despite his duties to Guest, he is satisfied with his current life of good food, a nice room, and fine clothes. Fond of Japanese sake and chestnut yokan.