Sailor Lethe and Sailor Mnemosyne appear only in Act 48 of the manga. They are twin sisters and come from the planets Lethe and Mnemosyne, respectively. Their planets were small, poor, and plagued by violence and chaos. When Galaxia appeared and brought death and ruin, the two had no choice but to follow her in the hopes of someday finding peace.    Sailor Lethe is named for a naiad in Greek mythology, and for a river of the Greek underworld where dead souls go to forget their past lives before being reincarnated.     Sailor Lethe first introduces herself as the ferryman of the desert river. She traps Eternal Sailor Moon at the bottom of the River of Oblivion, kills Luna, Artemis, and Diana, and attacks Sailor Moon. She is stopped by Sailor Mnemosyne, who says that Sailor Moon has been hurt enough.    Lethe says that Sailor Moon's Sailor Crystal, the Ginzuishou, is the cause for all of the wars they are experiencing, and that if it is destroyed, there will be peace. Sailor Moon offers her life if it will end the violence. Lethe and Mnemosyne are so moved by her self-sacrifice that they realize that whether or not Sailor Moon dies, the war will continue. Just as they are about to release the Senshi, Sailor Chi and Sailor Phi appear. These call Lethe and Mnemosyne useless fools and take their Sailor Crystals, which kills them.    Sailor Lethe has an attack called &quot;Galactica Myosotis Alpestris,&quot; which she used to attack Usagi. Myosotis alpestris is the name of an alpine species of Forget-me-not.

Usagi Tsukino is a normal girl until she meets up with Luna, a talking cat, who tells her that she is Sailor Moon. As Sailor Moon, Usagi must fight evils and enforce justice, in the name of the Moon and the mysterious Moon Princess. She meets other girls destined to be Sailor Senshi (Sailor Scouts), and together, they fight the forces of evil!
 
(Source: Kodansha USA)
 
Notes: 
- The tankoubon release contains 52 Acts and 9 bonus chapters across 18 volumes; chapter/volume counts follow the tankoubon release. 
- The shinsouban release contains the original 52 Acts plus 8 new Acts across 12 volumes, but no bonus chapters as all 9 were released separately in <a href="https://anilist.co/manga/38552/">Sailor Moon Short Stories</a> alongside another bonus chapter that was previously released in an artbook. 
- The kanzenban release contains both the 60 Acts and the 10 bonus chapters from the short story shinsoubans across 10 volumes.

Sailor Moon battles Shadow Galactica, an enemy threatening her friends in order to rule the universe. Can she protect her loved ones and persevere? 

(Source: Netflix Anime)

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Daughter of the italian voice actress Roberta Pellini.