Otomo
Otomo is Yuki's father; he owns with her the popular restaurant called Otomo's. Unknown by almost everyone, he's also the head of a dedective agency who colaborates with Tokyo's police force, but Otomo often keeps secrets from them (some important cases he wants to work on himself). To help him in his tasks, he has 4 guys working for him: Casey, Koji, Kyosuke, and Tamotsu. Nobody knows about it, except Meiko has her doubts and wants to find out what's going on with the four guys. Otomo is mostly the one with a short temper, but who can be very nice on the other side. Even if it doesn't look like it, he's fond of the four guys working for him and consider them as his own sons. He will also do anything to protect and help his daughter, Yuki. Most of his past is unknown. The only thing we know, is that he found Yuki a year ago, since he gave her in adoption when she was born, because he was too young to take care of her at that time. His wife also died at Yuki's birth.