 Nanoha Takamachi first appeared as a minor character in the eroge visual novel "Triangle Heart 3", released on December 8, 2000.She was first cast as a magical girl on a merchandise CD "Triangle Heart 3 ~Lyrical Toy Box~", released on June 29, 2001.Nanoha's first animated appearance was in the first episode of "Triangle Heart 3" OVA adaptation, released on July 24, 2003.