Misuzu Midorikawa, Lynn's Japanese-born mother, met English nobleman George Russell, Viscount of Marble, during his business trip to Japan. Their relationship led to Lynn's birth, after which Misuzu raised her daughter in Japan alongside her own parents. Determined for Lynn to know her father, Misuzu journeyed with her young daughter to England years later. Shortly after their arrival, en route to Marble Mansion, their vehicle met with tragedy. In the accident, Misuzu shielded Lynn from harm, sacrificing her own life to save her child.

George Russell had chosen Misuzu partly due to her personality, which echoed that of his late first wife Frances Russell. Misuzu embodied kindness and gentleness, showing deep devotion to her loved ones. Her ultimate aspiration for Lynn was for her to mature into a "true Lady"—graceful, strong, and noble. This wish became Lynn's driving force after Misuzu’s death.

Misuzu bequeathed a personal item, the Lady's Key, to Lynn as both a keepsake and a symbol of her mother’s vision. Originally naming her daughter Rin Midorikawa to honor their Japanese heritage, this was later anglicized to Lynn Russell in England.

In the sequel *Hello! Lady Lynn*, set three years after these events, Misuzu’s legacy endures. She appears in Lynn’s dreams during moments of despair or doubt, manifesting as a spiritual guide who offers solace, direction, and renewed courage. Her presence fortifies Lynn’s commitment to becoming a lady, cementing Misuzu’s influence as a cornerstone of her daughter’s growth and ambitions throughout the narrative.