Misshitsu no Hisoka na Hoshi

Another detective has set up an agency right next to Ukai's own, and it turns out to be none other than his old high school classmate, Kondou, aka Chikamichi. Easily dodging all of Ukai's protests, Chikamichi begins to help with commissions until he ends up becoming a fixture in Ukai's life.

Back in high school, Chikamichi had placed a firm distance between the two of them, which shocked Ukai a bit. What could be the reason behind Chikamichi's reappearance?