Kiichi Aoe

Thirty-one years old, first appearance: volume 2. A doctor, Aoe Reiji’s elder brother, the self-professed "Queen of Aoe", and a close friend of Yanase Izumi and Naoya, both of whom he tenderly endears. He thinks of Naoya as another brother. Kiichi is always concerned about Reiji, and is often pokey about his (other’s) business. He’s playful, too. He's the one who came up with the kitten nickname for Naoya. He served once as doctors to both Yanase Izumi and Saginuma Tomoki.