Mikiko Kashiwagi is a middle-aged woman who serves as a close friend of Haruko D. Dieckmann and the family lawyer responsible for the Kaidou brothers, especially the eldest, Haru Kaidou. She is also the mother of Hosaka Kiyomine. In the second season of the anime, she continues in her supporting role, acting as a legal guardian and advisor for the brothers’ affairs. Mikiko has short, dark brown hair and is often seen wearing a formal suit, typically a grey jacket over a white blouse. Her eyes are described as violet or green depending on the source. She is a serious and diligent professional who takes her work seriously, but she also shows a kind and caring side toward those close to her. Like her friend Haruko, she has an eccentric and talented nature. This eccentricity is evident early on when, upon Haru’s first visit to her office, she kicks him as a greeting. Beyond her legal expertise, Mikiko plays a key role in helping Haru understand the family situation; it is she who informs Haru that Ren has been officially registered in the Kaidou family registry for five years, thereby reminding him of his duty as the eldest brother to take care of Ren. Her motivations center on supporting Haru and the Kaidou family, providing both practical legal help and emotional encouragement. She does not undergo significant character development in the second season, remaining a stable and reliable presence. Her notable abilities are limited to her profession as a lawyer, which she uses to handle the family’s legal matters.