Sailor Saturn
After students from the prestigious Mugen Academy become victims of a group of villains called the Death Busters, who transform them into Daimons, Usagi and their friends meet two Mugen Academy students: car racer Haruka Tenoh and violinist Michiru Kaioh. Haruka and Michiru are the civilian identities of two new Sailor Guardians: Sailor Uranus and Sailor Neptune, who are initially reluctant to work with Sailor Moon and the others. Chibiusa befriends a mysterious girl named Hotaru Tomoe, daughter of Mugen Academy founder Professor Tomoe, who is later revealed to be a key figure of the Death Busters. Sailor Pluto is reincarnated as university student Setsuna Meioh, and she joins Sailors Uranus and Neptune. Using the power of all the Sailor Guardians, Usagi gains a new transformation: Super Sailor Moon. The Sailor Guardians learn that Hotaru's body is host to Mistress 9, partner of the leader of the Death Busters, Master Pharaoh 90. At the same time, Hotaru is also the reincarnation of the Guardian of Silence, Sailor Saturn, who has the power to destroy the whole world. For this reason, Sailors Uranus, Neptune, and Pluto fear Saturn's awakening. In the climatic battle, Pharaoh 90 begins to merge himself with the planet, but the newly awakened Sailor Saturn uses her power to send him back to his dimension, the Tau Star System, sacrificing herself in the process. As Neo-Queen Serenity, Usagi restores the city and resurrects everyone that was killed in the battle, including Hotaru, who is reborn as an infant alongside Saturn's spirit within her once again. Haruka, Michiru, and Setsuna vow to be Hotaru's family and leave the city, with the promise to rejoin Usagi and her friends someday.