Like the R Season, Sailor Stars is divided into two parts:

The first part resolves some conflicts from the SuperS season, and sees the return of the Outer Senshi, Haruka, Michiru, Setsuna, and Hotaru (now reborn as a child).

In the second part Usagi bids farewell to Mamoru, who is going to America to study. At the same time, the Three Lights apper, an idol trio consisting of three boys, Seiya, Taiki, and Yaten. The new enemy is Galaxia, a woman who desires to rule the entire galaxy by collecting the Star Seeds of humans. Three new Senshi appear, the Sailor Starlights, who have their own reasons to stop Galaxia, but without Sailor Moon's help.