Sailor Neptune (セーラーネプチューン, Sērā Nepuchūn) is a fictional lead character in the Sailor Moon media franchise. The alternate identity of Michiru Kaioh (海王 みちる, Kaiō Michiru, or Michelle Kaioh in the English adaptations), a teenage Japanese schoolgirl. Michiru is a member of the Sailor Soldiers, female supernatural fighters who protect the Solar System from evil. Introduced in the third story arc, Sailor Neptune fights alongside her partner/lover Sailor Uranus.