高城 秋五

A private detective based in Ueno. Used to work with Reiji and Uozumi and still helps out his friends when needed. Married to Kazuna, a former client with whom he shares a lot of history. Since she's currently pregnant, Shugo focuses on less dangerous tasks like investigating cheating spouses and searching for people in order to worry her less.

He is the younger brother of Natsume, and older brother of Nana.