When Mamoru was little he gave a rose to a little boy named Fiore. Fiore promised that one day he would bring Mamoru lots of flowers. Now Fiore has come back to earth but his intentions are not merely to fulfil a promise...
 
(Source: Anime News Network)

An unusual snow storm hits Tokyo and the Sailor Senshi discover that an evil snow queen Kaguya, wants to freeze the entire earth. It's up to the Inner Sailor Senshi along with the Outers, to defeat the Queen. Meanwhile, Luna falls in love with a human astronomer named Kakeru whose girlfriend is an astronaut about to take a space shuttle mission. Kakeru becomes ill and Luna wishes she could be a human to help him.

Usagi and Chibiusa overhear two girls talking about the Sailor Senshi after they see a poster. Humorously, as the girls discuss which is the smartest, most elegant, strongest, and the leader of the Senshi, Usagi claims those titles for herself. Chibiusa shakes her head at Usagi's delusion. Clips are shown from the debut of each Sailor Senshi, and that girl's image song is played in the background. When even Tuxedo Mask is mentioned, and the girls go to leave without having mentioned Sailor Moon, Usagi butts in on their conversation and asks them directly about Sailor Moon. The girls give a series of glowing compliments about Sailor Moon, but unlike they did for the other Senshi, they also list her faults. After the girls leave, Usagi sarcastically apologises for being a clumsy cry-baby and then bursts into tears. 
(Source: Wikipedia)

The season is divided into two arcs. 
The first arc shows Usagi and Co. having their memories restored from the first season. Their enemies are a pair of aliens, Ail and Ann, who are seeking human energy to restore their life tree. Mamoru had yet to recover his memories and he appeared as the Moonlight Knight rather than Tuxedo Kamen. This arc only lasted for 13 episodes. 
The second arc introduces Chibi-Usa, a little girl from the future who is searching for the Silver Crystal. The new enemies are the Black Moon Clan, comprising of the Ayakashi sisters (Cooan, Beruche, Karaberas, and Petz), Rubeus, Safir, Esmeraude, Prince Demando, and Wiseman. They too want the Silver Crystal so that they can take over the future. The Sailor Senshi's adventure continues...

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