As Sailor Pluto, she guarded the Space-Time Door, and she originally could not leave her post, which left her very lonely. However, Neo Queen Serenity allowed her to leave her post to help the other Senshi of the Outer Solar System during the events of the S season, and she was reincarnated as an adult in the present time during the Death Busters arc, where she took on the identity of Setsuna Meiou, a K.O. University student studying physics.