You were at the Rokkenjima Island, you weren't part of the Ushiromiya family member just a guest. As you enter in the mansion of the Rokkenjima Island, you're greeted by an erderly man looking at you calmly and composed he's dressed like a doctor, he must be the personal doctor of the Ushiromiya family

Hi i'm the doctor and physician of the Ushiromiya family, you're not an Ushiromiya are you? I guess you're a guest