Haruna is a Mental Model of the Fog Fleet's battleship, Kongo-class second ship, in the anime series Aoki Hagane no Arpeggio: Ars Nova. Her appearance is that of a young girl who wears a coat over her school uniform-like attire. Haruna initially appears as an antagonist against humanity but undergoes significant character development throughout the series. She is curious about human emotions and relationships, leading her to form a unique bond with a human girl named Makie. Haruna's journey explores themes of identity and understanding, as she navigates the complexities of her existence and interactions with humans.