Conjunction
costars

Izono Machi
Machi is the owner of the Izono Criminal Research Center, and Kazuhiko's boss. She used to be on the police force. Several years ago, a mail bomb was sent to her at the Police Department, and the explosion caused her to lose the ring and small fingers on her left hand.

Izono Miwa
Machi's younger sister Miwa is a high school student. At first she didn't trust Kazuhiko, but later she seems to take up flirting with him.
Sasayama
A police profiler who is not very good at his job. He mostly depends on Kazuhiko, and he is lazy and takes credit for Kazuhiko's work.

Toguchi Kikou
"News reporter" for a local station, he looks like something of a hippy and is always biking around with his camera, trying to get the story. He's knowledgable about many subjests, especially Lucy Monostone.