Tomoe Minoru has raised to believe that he was her son, but in truth it was her sister Akane held as a surrogate mother and Tomoe then took him to a head after his birth parents in an accident killed. In addition to their penchant for clumsiness, who time after time keys, important documents or forgotten like leaves when her job as head nurse is in a hospital, has also Tomoe a heart of gold and feels responsible for the boy on charges that she herself makes for an incident with her sister, where she was really not to blame.