Having decided to walk down a path separate from their inspirations as idols, the girls of Aqours are more determined than ever to shine brilliantly as school idols. With their previous performance marginally increasing the number of prospective students for their endangered school, they look to carry the momentum of their small step forward into the school's upcoming open house and the next Love Live competition. Hoping to use these events to bring more attention to their school, the nine girls look to give their best performances yet. Unfortunately, these small steps forward are not enough to convince Mari Ohara's father from changing his plans. Undeterred by Mari's pleas for reconsideration, the decision to close down the school is made official, putting an end to Uranohoshi Girls' High School's student recruitment, including the open house. Though all hope seems to be lost, the school idols refuse to give up. Faced with impossible odds, Aqours sings, dances, and shines in the hopes of bringing about a miracle.

Ritsuka Tachibana has always been a good student, so she is completely shocked when she is suddenly summoned by the student council for breaking school rules. Led by Rem Kaginuki, the student council—also consisting of Urie Sogami, Shiki Natsumezaka, and Mage Nanashiro—tries to interrogate her, but it soon becomes clear that they have ulterior motives. However, this is only the beginning of Ritsuka's misfortune. When her mother gets kidnapped, her life is turned upside down, and Ritsuka gets drawn into a battle for supremacy between vampires and devils. Both groups are searching for the Grimoire, a forbidden item that allows its owner to rule the world, and Ritsuka is somehow connected to this strange artifact. The return of Ritsuka's protective brother Lindo from overseas gives her hope that life could return to normal. But even her sibling is harboring his own dark secrets. Ritsuka begins to question whom she can trust, and if she can ignore her growing attraction toward the devilishly handsome student council members.

In a dystopian future, detective Shinjuurou Yuuki—known by some as the Defeated Detective—solves mysteries throughout Tokyo. Aided by his odd associate Inga, Shinjuurou's insight and ingenuity in cracking cases, particularly homicides, lead to numerous mysteries solved and culprits caught. However, his partner seems to have some other, more sinister intentions for the people they catch, and the truth of the assistant's identity and motivation is shrouded in secrecy.

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.