Naoya Sagiri

In Extra, Sagiri Naoya was a doctor by profession. When he was still a novice, Sagiri had been close to the Ayamine family, enough that he thought of Kei's mother as his own, and also worked as Ayamine Kei's personal doctor. In the Unlimited/Alternative timelines, Sagiri Naoya is a Captain of the Imperial Japanese Mainland Defence Force and the commander of the 1st Tactical Armor Regiment, a prestigeous position granted to IJA/MDF troops tasked to protect the capital of Japan, Kyoto.