Sailor Kakyuu is Princess Kinmoku, first order Imperial Princess of the Red Ceres Kingdom of the Planet Kinmoku. Kinmoku means "fragrant olive" as can Kinmoksei, though kinmoksei can also mean "The Olive Star" or "The Planet Kinmoku". She is also sometimes called Sailor Kakyuu, and this is where the "Fireball" meaning comes from. Princess Fireball is the princess the Starlights came to Earth looking for. On their own planet Kinmoku, her lover had been killed by Sailor Chaos and she had almost been killed battling Galaxia, but her starseed was saved in an incense burner protected by ChibiChibi. When the Starlights saw the star of their princess had not gone out, they realized she was still alive somewhere (duh). They followed her scent, for she smelled like a fragrant olive. The Starlights found Princess Fireball, but when they did Galaxia felt her presence and came to attack. Galaxia killed Fireball (again), and the Starlights' princess died in the arms of Eternal Sailor Moon.