Chibi-usa arrives from the future to find the ginzuishou to save her mother, Neo-Queen Serenity, in the 30th century. She stays with Usagi's family having hypnotized them into believing that she is a family member. The new enemies are the Black Moon Family, consisting of the Ayakashi Sisters and the main family members: Rubeus, Esmeraude, Safiru, Demando, and Wiseman. Usagi and Mamoru break up in this arc, thanks to visions Mamoru receives from his future self, King Endymion, warning him that he must stay away from Usagi or else she will die.
The Black Moon family is after Chibi-usa and the ginzuishou in order to take over the future Earth. However, the Ayakashi sisters fail at this task, and they are healed by Sailormoon after they are betrayed by Rubeus. Chibi-usa eventually discovers the Sailor Senshi's identities, and Usagi and Mamoru get back together. Chibi-usa then takes them to the future to save her mother. There, they meet another new senshi, Sailorpluto, the guardian of time.
To make everything shorter, the Sailor Senshi find out that Chibi-usa is the daughter of Usagi and Mamoru in the future. The Black Moon are actually exiles from Crystal Tokyo, the Utopia of the future, which Usagi and Mamoru's future selves are the leader of as Neo-Queen Serenity and King Endymion. The Black Moon desires to take over Earth so that their people may live there. However, they are unknowingly being manipulated by Wiseman, or Death Phantom, for his own purposes. After running away from the Palace upon Sailormoon being unable to awaken her mother, Chibi-usa is kidnapped by Wiseman who warps her mind and causes her to transform into Black Lady. In episode 88, Usagi transforms into Neo-Queen Serenity and with Tuxedo Kamen's help, she manages to get Black Lady to remember her true past. Chibi-usa then discovers that she had the ginzuishou all along (it was sort of absorbed into her), and she and Usagi combine the power of their two ginzuishou to defeat Wiseman.
Rini and Serena hugged tightly. Rini said "Thank you... Mama". Rini turned away and used her key, vanishing into the future. Serena whispered goodbye, but Darien put his arm around her.In the future Rini ran on a hillside, with a restored Crystal Tokyo in front of her. She found Neo-Queen Serenity, King E., and the Sailor Scouts of the future waiting for her. She walked up and curtsied. Then she ran to her mother and hugged her. Neo-Queen Serenity welcomed her home.
