Tsukino Usagi is an ordinary girl with 14 years old, on her way to school she saves a cat with a crescent moon on his forehead. At home, after coming from school, she meets the cat again in her room. The cat talks to her, and the cat introduces herself as Luna. Luna gives the dubious Usagi the ability to transform into Pretty Sailor Suited Soldier of Justice, SailorMoon. SailorMoon is faced against the Dark Kingdom, which consisted in Beryl, Metallia, Zoicite, Nephrite, Kunzite and Jadeite. Her mission is to protect the world, while searching for the Moon Princess. She finds allies, Tuxedo Mask, a mysterious masked figure, and the inners Senshi: Ami/Mercury, Rei/Mars, Makoto/Jupiter, and Minako/Venus who is accompanied by Artemis, a white cat.

  Usagi's everyday life consists of her problems with Chibi Mamoru, a cute, but annoying college student. He is really Tuxedo Mask, but she doesn't know until later. Through the season, the seven Rainbow Crystals must be discovered, which produce the Ginzuishou, the Silver Crystal. Usagi and Mamoru discover each other's identities when they are trapped together by Zoicite. Usagi is the true Princess of the Moon, and Mamoru is her lover, Prince Endymion of Earth. Usagi receives the Ginzuishou, but Mamoru is kidnapped and brainwashed by the Dark Kingdom.

  After a whole bunch of filler episodes, Usagi, Ami, Rei, Minako, and Makoto must confront the Dark Kingdom, learning about their pasts on the Moon in the process. In episode 45, Mercury, Mars, Jupiter, and Venus all die trying to protect SailorMoon. In episode 46, Mamoru gets his memories back, but dies saving SailorMoon. SailorMoon then defeats Beryl and Metallia as Princess Selenity, then dieing, since if she uses the full power of the Ginzuishou (which she did), she dies. At the end of the episode, all the girls and Mamoru come back to life, but without their memories...

SailorMoon R

  The first arc of R is what is known as the filler arc. That is, the plot line does not happen in the Manga, but it is in the anime to let the Manga catch up. Usagi regains her memories after Luna revives it, when a new enemy force shows up. The enemies are Ail and Ann, two aliens who take energy from the humans on Earth to feed the Makaiju. Ail and Ann posed as two students, Genga Seijuurou and Ginga Natsumi, brother and sister. The plot becomes strange as Ail and Ann are really lovers, yet Ail falls in love with Usagi and Ann falls for Mamoru.

  The other Inner Senshi regains their memories, but Mamoru still does not. Instead, Tsukikage No Knight, a new ally, appears wearing a white turban to save the girls. SailorMoon gets her powered-up transformation, and the Inner Senshi get powered-up versions of their old attacks.

  Eventually the makaiju reaches the point where it takes over again, attacking Ail, Ann, M Mamoru, and Usagi. This is where Usagi reveals her identity to the aliens, and Mamoru remembers his past. Tsukikage No Knight is actually a part of Mamoru's soul. Ail and Ann becomes healed by SailorMoon, and they go off back into space.

  The second arc of R is the more interesting portion. In this arc, Chibiusa arrives from the future to find the Ginzuishou to save her mother, Neo-Queen Serenity in the future. The new enemies are the Black Moon Family, consisting of the Ayakashi Sisters and the main family members. Usagi and Mamoru split up in this arc, thanks to visions Mamoru receives from his future self, King Endymion.

  The Black Moon family is after Chibiusa and the Ginzuishou. However, the Ayakashi sisters fail, and SailorMoon heals them, and they become normal women. Chibiusa eventually discovers the Sailor Senshi's identities, and Usagi and Mamoru get back together. Chibiusa takes them to the future to see her mother. There they meet another new Senshi, Sailor Pluto.

  Chibiusa is the daughter of Usagi and Mamoru in the future. The Black Moon family is exiled from Crystal Tokyo, the Utopia of the future. They want to take over Earth and live there. However, they are being used by Wiseman, for his own purposes. Chibiusa becomes Black Lady, an evil villainous, upon being brainwashed by Wiseman. Usagi and Mamoru together make her remember her real self, and then Chibiusa and Usagi fight Wiseman with the two Ginzuishou, one of which Chibiusa possessed all along.

SailorMoon S

  The new enemy and the new Sailor Senshi search for the three Talismans, which, when brought together, they form the Holy Grail, which gives the holder the power to destroy or to save the world.

  The new Sailor Senshi are: Ten'ou Haruka - Sailor Uranus, and Kaiou Michiru - Sailor Neptune. They're lovers, high school students. Haruka and Michiru are extremely dedicated to their mission, willing to sacrifice each other to find the Talismans.

  The enemies are the Death Busters. They are lead by Tomoe and Kaorinite; they are basically crazy scientists bent on finding the Talismans, which are in pure heart crystals that some people possess. They use daemon eggs to create daemons to attack people and take the heart crystals.

  The blood gets pretty complex, as Rei receives visions of the "Silence", which will happen if the Talismans are in the hands of the Death Busters, and which Haruka and Michiru want to prevent. It's discovered in episode 110 that Haruka and Michiru actually have the Talismans inside of them, and in episode 111 that Meiou Setsuna, Sailor Pluto, has the third one. The Holy Grail is formed, which SailorMoon uses to become Super SailorMoon.

  Tomoe Hotaru arrives in episode 111, and she becomes a friend with Chibiusa. Hotaru is the daughter of Tomoe, and she is cultivated to have an entity, Mistress 9, live inside of her. Hotaru, upon swallowing Chibiusa's heart crystal, becomes Mistress 9, a Death Buster. However, Hotaru eventually defeats Mistress 9, becoming Sailor Saturn, the final Outer Senshi. In the end, Saturn and SailorMoon defeat Master Pharaoh 90 and bring peace to the world again. During all of this, SailorMoon’s Holy Grail is destroyed; Hotaru becomes a baby and returns to Tomoe, who is good again, and the Outer Senshi all leave - Pluto apparently dies.

SailorMoon SuperS

  Pegasus comes to Chibiusa, asking her to help him. He is wanted by the new enemies, the Dead Moon Circus, who owns a circus that the Inner Senshi frequently visits. Pegasus has the Golden Crystal in his horn, which the Dead Moon Circus, composed of Zirconia, the Amazon Trio, Amazoness Quartet, and Neherenia, want. They are also after the Golden Soul Mirror, that Pegasus is inside. Pegasus is really Helios, a boy who is the guardian of Mamoru, or Prince Endymion. He and Chibiusa have this little romance going on. Anyway, all the Inner Senshi get there power-ups to super forms. The Amazoness Quartet at the end are turned into normal girls, and Helios is freed. Neherenia is sealed away until Sailor Stars...

SailorMoon Sailor Stars

  The first arc is really good. In it, Neherenia returns, under the control of Galaxia, which you don't know until much later on. Neherenia seeks revenge on Usagi and the Sailor Senshi. The Outer Senshi return (even Pluto that dies in SailorMoon S), and all of them receive their new power-up's to super forms from Hotaru, who grows up rapidly. Mamoru becomes brainwashed and kidnapped by Neherenia. SailorMoon gets her new form, Eternal SailorMoon, and she goes after Mamoru. The Sailor Senshi follow, but they get trapped by Neherenia in mirrors; Eternal SailorMoon saves them.
It turns out the Neherenia really wanted a friend and was lonely, and that's why she was so malicious. She returns home, where she wakes up as a small child having a nightmare.

  The second arc introduces Galaxia and the Animates, who are after the star seeds of the Sailor Senshi. The Three Lights, an idol rock band, are new - they are really the StarLights, the new Sailor Senshi. The Three Lights are male, but transform into females, which are their normal forms, when they transform into sailor Senshi. They wish to find their Princess, who they find later. Mamoru is killed by Sailor Iron Mouse when he was in the plain, Usagi assists everything and faint's, Seiya grabs Usagi and feels that Mamoru star seed his goon.

  Seiya takes Usagi home, when she awakes her thinks that everything was a dream, and she believes that Mamoru is alive because Seiya writes and send postcard's to her.

  A young girl arrives, Chibi Chibi, posing as Usagi's little sister after brainwashing Usagi's mom. She has the chalice, which she uses to help Princess Kakyuu come to Earth.

  Eventually, the Sailor Senshi must confront Galaxia after Princess Kakyuu's star seed is stolen and she dies. The Inner Senshi are killed, their star seeds are taken; Mamoru is revealed to have died earlier on the plane. Neptune and Uranus turn evil, in an attempt to try to trick Galaxia, and they kill Pluto and Saturn. As they turn on Galaxia, she kills them. SailorMoon, Chibi Chibi, and the StarLights are left. Chibi Chibi is found to be the hope of Galaxia's star seed. SailorMoon obviously wins, and Galaxia becomes good again, leaving Chaos, who was the main villain's influence. The Inner and the Other Senshi are back to life, Princess Kakyuu to and Mamoru.

  When the StarLights are leaving, Seiya expresses her feelings to Usagi, but she doesn’t understand anything, and she fights with Rei and that kind of stuff, but Seiya says to Mamoru to take good care of Usagi, then they leave...
At the "end" Usagi says to Mamoru how does he feels for her, and he says that he loves her very much then they kiss "under" the moon and they all leave apply ever after, I think...