The five Sailor Senshi, along with Luna and Artemis, are determined to go to the Dark Kingdom's main base in the frozen, snowy North Pole and seal Queen Metaria away for good. But Queen Beryl will not allow the Moon Princess and her four protectors succeed from obliterating her one true mistress and confidant again, as they had done with the help of their beloved Queen Serenity a millennia ago.
Beryl states that Mamoru had died and has been resurrected as the strongest warrior of the Dark Kingdom, shaking Usagi's resolve once again.
Minako explains to the others how Queen Metalia is the one controlling Beryl, who in her previous life was the one who killed Endymion.
Beryl ensnares the Sailor Senshi, but Minako manages to call forth the sacred sword to break them free, before the girls launch a group attack to try and break the necklace that sends Metalia's power to Beryl. Though the necklace proves resilient, Usagi's desire to bring Mamoru to his normal self gives the sword the power to break it, destroying Beryl in the process.
Afterwards, words appear on the sword, stating it can use the power of the Legendary Silver Crystal to restore the Moon Kingdom, but Metalia has Mamoru steal it, forcing Usagi to chase after him through a portal taking them to the North Pole. As Usagi confronts Mamoru, who has the power of Metalia behind him, the other Sailor Senshi end up having to confront the Shitennou in order to reach her. The Senshi manage to purify the Shitennou and remind them of their true purpose, but Metalia kills them.
Learning from Luna that a piece of the Silver Crystal is inside Mamoru's body, Usagi, failing to purify him with the Moon Healing Escalation, strikes Mamoru with the Sacred sword before stabbing herself with it.