Spoiler — from the ending. Tap to reveal.
“Dummy, you won't be alone. You still have Mamoru, remember?”
3 quotes from Sailor Moon, each with commentary on what it means and why it stuck.
“Dummy, you won't be alone. You still have Mamoru, remember?”
“I can't believe she actually tried to go through this all by herself. If only she had told us sooner. We could've helped her!”
What prompts this is Ami's report: Mamoru never arrived at his university in America, and Usagi kept it to herself; one episode earlier she finally broke down to Seiya over the letters he never answered. Rei's objection is not to the worry. It is to the solitude, and Sailor Stars builds its ending out of that objection. The same fault comes back three more times, each with higher stakes. In the episode after Rei's death, Uranus admits the four Outer Guardians meant to settle Galaxia by themselves and failed. One episode later, Usagi, sobbing over Uranus and Neptune, asks why they never told her. In the last episode Chibi Chibi's voice explains that Galaxia sealed Chaos inside herself and was corrupted by it from that moment. By then the season has shown a secret burden failing four times, and an ending built on friends who stay with Usagi as long as she does not give up can read as an answer rather than a whim. Rei states the thesis first, and she states it as a grievance, which keeps it from sounding like a lesson. She dies in the next episode without seeing it proved.
“If she's Chibiusa's little sister, wouldn't that also make her Usagi and Mamoru's second child?”
Usagi and Minako squeal with delight before Setsuna challenges the proposed family connection. Rei has phrased a conditional, but the reaction treats it like welcome news. Ami's observation that Chibi Chibi resembles Usagi has already made the possibility attractive; the conversation needs very little more to start celebrating it. Rei's reasoning is not foolish on its own terms. If the proposed sibling relationship holds, the question follows. The weakness is that the premise has not been established. Setsuna addresses that gap by saying that, as far as she knows, Small Lady is Neo-Queen Serenity's only child. Her qualification keeps even the correction tied to what someone knows rather than making it a view from nowhere. That is why the exchange works better as a warning about premature certainty than a rebuke to affection. Usagi's willingness to welcome a little girl has value. The delight becomes unreliable only when it starts doing the work of identification.
Usagi has just held her to a promise: Rei swore, Usagi sobs, to be with her till the very end. Rei answers by keeping the promise in the only form left, which is assigning it to someone else. Before that she reaches for the old register ("Don't be such a baby"), and the "Dummy" here is the same voice. What follows it is new: "Sorry that I won't be there to protect you anymore." Mercury, Jupiter and Venus have already faded; Rei goes last and spends her last breath on being gentle. The name she chooses is the problem. One episode earlier on the same page, Ami reports that Mamoru never showed up at his university in America, and Rei says she cannot believe Usagi tried to go through this all by herself. Rei is handing Usagi to a man she already knows is missing. The next episode's transcript settles it: Usagi cries out at Galaxia, "No! Mamo! You killed him!", and when she wakes at Ginga TV she lists "Mamo, Rei and all the others" as gone. Usagi is left holding a reassurance with nothing behind it, and two episodes later Sailor Star Fighter has to supply a different one: that her friends placed their hopes in her.