After Sailor Moon has no choice but to kill Endymion, the Princess uses her power to destroy the world again, and the other Senshi are too late to stop it. Realizing that the world's demise was, in fact, the result of her selfishness, Serenity uses again the power of her love for Endymion to bring the world back to its original state, giving Usagi and Mamoru a second chance in life.
Having seen Makoto become willing to throw her life away to complete her mission, Minako reflects on her own captivity to her past. Meanwhile, Rei, arriving at the Dark Kingdom thanks to Mio, meets with Mamoru! ""Even if it costs me my life, I'll see my mission to the end!""
Rei and Minako antagonize over their reactions of their previous life. Rei asserts that Minako- having never awakened her senshi powers- has no qualifications to fight, but that's because she has something in her mind. Meanwhile, coming to the conclusion that no matter how much she hopes it would happen, she'll never have Endymion's heart, Queen Beryl at last comes to the decision to take the Princess's life.
Naru enters a coma after Princess Sailor Moon awakens again. Usagi conjectures that negative emotions fuel her power, so she tries her best to suppress such emotions.
Facing Sailor Moon, Mamoru- as his previous-existence alter-ego Endymion- drew his sword! With the intention of not repeating the tragedy of their previous life, Endymion declared war upon Usagi. But Usagi's feelings will not change. She will gallantly continue to believe in Mamoru. Also, in a completely unexpected twist, Aino Minako's office president requests Usagi's mother to become a television reporter! (I prey they change this and get a nicer one)
Exactly what happened in her previous existence was finally revealed by Princess Sailor Moon's very own lips. Luna and the senshi cannot easily get over something like this. Meanwhile, having heard from Queen Beryl the truth, Mamoru strengthens his resolve. ""I destroyed the planet...."" With these words, Princess Sailor Moon disappears once again. Inside her heart, she is facing off against ""Usagi"" but... ""The Princess' existence is surely call for calamity to this planet!""
Usagi, having lost Chiba Mamoru to Queen Beryl, must suppress her feelings of concern for him and believe in his return. And while Luna wasn't looking, Usagi disappeared! Since the last thing Luna had heard was a harp's note, Usagi must be in her Princess form. Relying on this note, the senshi begin their search for the Princess. Meanwhile Mamoru, taken to the Dark Kingdom, faces his retainers from his previous existence, the Shitennou.
Aino Minako (Sailor Venus) lets Rei in on an important secret. While Rei, having been told such a secret so suddenly, is unable to hide her shock, she doesn't have time to lose her bearings. Their enemies are growing stronger by the minute. As Rei and the rest are staying vigilant, the Dark Kingdom's ruler, Queen Beryl, having desired Endymion since their previous existence, has finally appeared in front of him.
Usagi and Mamoru's relationship has been prohibited since their previous existence, but the two of them- vowing that things ""won't be like last time""- begin their love anew. Given Usagi's excessive zeal, the other senshi cannot bring themselves to strongly oppose them. Yet Sailor Venus, knowing full well the horrors of their relationship, refuses to forgive it. Whilst she considers methods of stopping them, in front of her materializes Zoisite. With the same desire to pull the two of them apart, Zoisite makes Venus a proposition.
Makoto worries about being the only Senshi whose power has not yet been awakened, so she tries whatever she can to make it, while dealing with her feelings and Motoki.
Ami is back to normal, and tranquility has returned to them all. Arriving at their school is a new, mysterious exchange student, Kuroki Mio. But she is a rival of Aino Minako, and also...?! Having transferred to Juuban Middle school is a new idol, Kuroki Mio. Usagi burns with hostility as the girl is ""Like Aino Minako's rival!"" And finally the two of them enter a volleyball match!
After Usagi learns that Mamoru is Tuxedo Mask, Hina realizes his feelings might belong to another. Meanwhile, Kunzite has a hunch that Sailor Venus is not the real princess.
Even though Usagi decided to stop thinking about Mamoru, she runs into him in the street. After learning that he's leaving to study abroad Usagi is overjoyed, but when Hina reveals that he'd possibly been attacked by someone named Kunzite, Usagi leaps into action and runs to his rescue.
Rei runs into Minako during one of her monthly visits to the hospital and gets forced into putting on a performance for sick children. Now it's Usagi to the rescue, who is there to help Rei in her time of need.
After the team's introduction to Dark Mercury, Usagi finds that Ami has turned their class against her. Later, Mars and Jupiter battle a Youma while Ami challenges Sailor Moon to a fight.
Usagi takes a sick day following the situation with Mamoru, but Ami is also noticeably missing from school. Makoto finds her curled up in bed and cares for her before Ami makes an odd request to go to an amusement park where she passes out! Ami is rushed to the hospital where she later escapes and makes her way to Kunzite for a startling discovery.
Hikari asks Usagi to go on a double date with Daichi and Mamoru, but they are followed by Minako and Usagi soon learns that Mamoru and Hina are engaged. Meanwhile, Rei goes off on her own and Kunzite plots to capture his own Sailor Senshi.
It's Valentine's Day and Usagi is babysitting a young girl with a similar romantic crisis. The two are able to use their own situations to help give the other more courage.
Rei and Minako are butting heads with each other. Meanwhile, Usagi is still distraught over Mamoru, who is about to get caught up in a youma trap with his girlfriend.
Usagi is overwhelmed by her feelings for Mamoru and decides to get over him by making a scarf for Tuxedo Mask. Meanwhile, Rei visits her mother's grave and runs into Minako... who she sees transform into Sailor Venus!
Ami is jealous of Naru's relationship with Usagi. Meanwhile, Youma are causing people to disappear in order to steal their energy.
Usagi goes on a mission to recover Minako's stolen jewels. Meanwhile, Ami has tension with Naru but won't tell the others why.
Usagi faints as Kunzite's spell to transform her into a Youma comes back into affect. While Makoto and Rei run off to find Kunzite, Ami does her best to help Usagi fight back.
Usagi and Mamoru help Motoki find his pet turtle, leading them to a kind hermit with no memories. Meanwhile, the evil Queen Beryl intends to awaken her fourth general, Kunzite.
Usagi aids Minako in escaping her manager and spend some quality time together. Later on, Sailor V reveals herself as Sailor Venus, princess of the Moon Kingdom.
Minako is being cared for at the Juban Hospital and Usagi and Makoto abandon the Sailor V search to visit her. Meanwhile, Rei, Ami and Luna go check out a hint on the internet about Sailor V which turns out to be a trap set by Zoicite.
Usagi runs away from home and eventually winds up with Rei at her shrine. There, Luna sees a connection between the legend of Princess Kaguya and the real Moon Kingdom. Meanwhile, Zoisite formulates a plan to destroy all princesses under his hopes of defeating the Princess of the Moon.
When Tuxedo Mask reveals information of the Mystical Silver Crystal to the public to speed up the search for it, the mad rush brings a wealthy businessman to ask for Rei's protection of his gem that seems authentic. Meanwhile, Usagi fights her feelings for Tuxedo Mask after being warned by Sailor V that he is the enemy and gets in big trouble for helping him.
Rei and Makoto get into a petty argument and when arriving to apologize, Makoto thinks Rei is being kidnapped. Meanwhile, Usagi works very hard for a mascot costume contest for pop idol, Minako Aino, and is attacked by Jadeite at the contest.
Usagi is saved by a new girl in town from the bullies. When Usagi realizes the girl who saved her is at her school, she befriends her. The new girl, a tomboyish Makoto Kino, seems tough on the outside, but when she lets her guard down for a popular basketball player who turns out to be a Youma in disguise, the vulnerable Makoto must awaken as Sailor Jupiter to defeat him.
When Ami feels that her friendships with Usagi and Rei are not genuine, she reads a book on how to be a true friend. This causes friction between her and Usagi, and Ami gets into more trouble when she tries to defeat a Youma without calling for help.
There is a rumor that the Mystical Silver Crystal will be exhibited at a high-society costume party. Tuxedo Mask decides to look for it, followed by Usagi, but the Dark Kingdom is still one step ahead. Meanwhile, Rei refuses to cooperate with Usagi and Ami, choosing to act on her own.
During a string of disappearances of miko priestesses, Usagi runs into one of them, Rei Hino, who is the prime suspect of the missing girls. Usagi defends her reputation, until the two got pulled into another dimension by a Youma, causing Rei to awaken as Sailor Mars.
Usagi Tsukino is a clumsy teenage girl who becomes a Magical Girl named Sailor Moon after meeting a cat named Luna, who tells her she is a destined warrior who must find the reincarnated princess of a lost kingdom. Along the way, she meets other reincarnated warriors who join her group known as the Sailor Senshi who fight the forces of the evil mastermind behind the Dark Kingdom.