Sailor Moon's Entire Backstory Explained

Thousands of years prior to the start of Sailor Moon, the solar system was ruled by a peaceful matriarchy of long-lived moon-dwellers, empowered by the mysterious Silver Crystal. This tranquil era became known as the Silver Millennium, and at its apex, it was presided over by the gracious Queen Serenity. For generations, this system worked as intended: the Queen oversaw pleasant relations between the planetary societies, art flourished, and even some particularly 1990s conceptions of advanced computing took root in the lunar soil. Though the sailor soldiers did, in fact, exist during this era and were similarly charged with peacekeeping throughout the galaxy, they had quite a lot less to do. 

Though Queen Serenity appeared to rule alone, sans any king or consort, she did have a daughter: Princess Serenity, who would go on to be reborn as Usagi Tsukino, she who would become Sailor Moon. Though the princess was as beautiful and benevolent as her mother, she was far younger — and it showed. She preferred pranks and playtime to protocol, had to be calmed by her mother after enduring nightmares, and spent as much time evading her sworn sailor guardians as she did obeying them. Ideally, she'd have had centuries to mature into the steadfast queen the Silver Millennium demanded — but that, of course, did not come to pass.

All the marble verandas and talking cats in the galaxy could not, unfortunately, keep Princess Serenity content forever. She longed for adventure, excitement, and novelty — and found it in the last place anyone could have ever expected. Somehow, she and Prince Endymion, her equivalent on Earth, met each other, fell in love, and embarked upon a clandestine relationship expressly forbidden by the laws of their lands.

Relations between the moon and the Earth grew more and more frayed during this time. Rebellion was brewing, stoked by the earthlings' distrust of the Silver Crystal's magic. Why did the people of the moon deserve to command its prodigious powers — to say nothing of the functional immortality it granted them? Queen Metalia, a primordial being of spite and greed, took advantage of this burgeoning disorder, ultimately using the woman who would become Queen Beryl as a figurehead. In swift succession, Serenity became a symbol of the moon's mendacity, Endymion's love for her was deemed an unforgivable betrayal, and the violence that would tear the lovers apart exploded into open warfare. The Silver Millennium was over, and with it, Princess Serenity's childhood.

Centuries passed until the souls of the Silver Millennium found a home in modern-day Japan. Though they all took root near Tokyo's Azabu-Juban district, their lives varied wildly: Sailor Mars became a reserved keeper of her family's ancestral Shinto shrine, Sailor Mercury was raised by her elegant single mother, Sailor Jupiter was orphaned at an early age, and Sailor Venus led a pre-series life as the vigilante Sailor V.

What life was Princess Serenity reborn into? A remarkably normal one, especially when compared to her friends: as Usagi Tsukino, she became one of two children born to Ikuko, a housewife, and Kenji, a magazine editor. She is, at the story's outset, a cheerful girl with many beloved friends, still very much the bright-eyed princess she'd been. But she is also, as her very own internal narration reveals within the first few pages of the series, "kind of a crybaby," a lazy student, and a bit of an all-around brat. Her heart, of course, is pure in all the ways that matter — she might drag her feet on the way to a challenge, but she'll show her mettle once she's there — but one is better off not asking after her most recent test scores. In this sense, she was very much still the girl she'd been thousands of years in the past: kind, silly, and more than a little prone to pursuing her heart, no matter where it might lead.

Naoko Takeuchi filled every corner of the Sailor Moon universe with references to mythology, folklore, history, and, of course, the vast and varied world of astronomy. No character embodies that tendency more than Sailor Moon herself — especially her name.

To begin with, "Usagi Tsukino" translates to "rabbit of the moon." Usagi is very much aligned with rabbits throughout the series, to the point that the original English edition of the series translated her name as Bunny. But the comparison goes beyond the adorable and into the genuinely fascinating when one learns of the name's legendary origins. The "rabbit in the moon" is a major figure in East Asian folklore, based on what many see as the shape of the animal in the moon's darkest craters. Opinions differ as to what the rabbit is doing, though most agree it looks to be using something like a hammer and container: certain Chinese legend connects the story to the myth of Chang'e, while the 8th-century poet Li Bai described a rabbit "pounding medicine" in his work. In Japan, the rabbit is imagined to be making mochi. The story is so widespread that Apollo 11 astronaut Michael Collins mentioned keeping an eye out "for the bunny girl" — though if he did, in fact, run into a sailor soldier up there, he's stayed mum.

Astronomy and Japanese folklore might be the most prominent places Naoko Takeuchi drew inspiration from, but they aren't the only ones by a long shot. The romance between Usagi and Mamoru, a central pillar of the series across adaptation and medium, is, in fact, drawn from the Greek myth of Selene and Endymion.

Like all ancient myth, its interpretations are many and opinions differ as to what should be considered the "real" story — if, in fact, one can be divined at all. But basically, the story goes like this: Selene, goddess of the moon, fell in love with the earthbound Endymion. Some stories suggest he was nothing more than a mortal shepherd, while others depict him as a king, perhaps with a divine father in Zeus. Regardless, he was bound to the earth and stubbornly mortal, and so Selene convinced Zeus to put him in an eternal sleep, so that he might live forever. Some stories go on to tell of the 50 daughters born from their union, while others bring in Hypnos, god of sleep. What they all have in common is the love that bound the goddess and the man together — a connection so strong, it would go on to inspire Takeuchi's own tale of love unbound by time and space.

A big part of the fun of creating any character is sprinkling them with the sort of details that might never make it to the page. What's their favorite food? Biggest guilty pleasure? When were they born, and how do they celebrate their birthday? Naoko Takeuchi indulged in this to a degree even the most seasoned fans might not be aware of. Did you know, for example, that Sailor Mercury's favorite food is sandwiches, and that Sailor Venus has a tendency to mouth off to cops?

Sailor Moon herself is no exception. Every aspect of her name, background, life, birth, and health were lovingly determined by Naoko Takeuchi — and each and every one contains character information. Usagi's birthday, June 30, makes her a Cancer, often described as the emotional center of the zodiac and — you guessed it — ruled by the moon. June's birthstone varies depending upon who one asks, but generally speaking, it's moonstone (surprise, surprise!) and the pearl, both of which symbolize purity. One detail Western fans might not expect to be salient is Usagi's blood type, which is O, the highly helpful universal donor. Japanese culture holds blood types to be indicative of certain personality traits, those with type O blood being confident, intuitive, and agreeable. From her birth to her body, all details agree: Usagi was born to be a beacon of kindness, joy, and empathy for all the world.