Wilhemina is a student at a marine school in Germany who can sometimes be hot-tempered but also has a caring side. She helps improve the effectiveness of her crew by straightening them out during battles. Wilhemina often refers to herself as "washi" and this habit amuses the Harekazes crew, especially since she learned it from watching Japanese gangster movies with Kouko Nosa, who is also interested in these films.