In the year 20xx, a baby was born. This baby was neither male, female, nor intersex. The baby had a third reproductive organ, distinct from both male and female anatomy.

The baby was named Zero, and this new gender was designated as “Z.” The medical team observed Zero, partly as a test subject.

Zero began to grow with a body type that wasn’t as muscular as a typical male but wasn’t as soft as a female. The reproductive organ could protrude like a male’s or retract like a female’s, adapting as needed. Zero primarily used unisex restrooms.

Astonishingly, Zero demonstrated remarkable athletic ability. In the 50-meter sprint, Zero outperformed male classmates and excelled in ball games, quickly gaining popularity among female students.

The medical team continued observing Zero, curious about what form secondary sexual characteristics might take during puberty. Zero’s appearance was both masculine and feminine, while physical strength continued to grow, leading Zero to break a national student record in track and field.

Popular among peers, Zero went through several relationships before finally graduating from university and starting a career as a real estate salesperson.

One day, Zero began experiencing morning sickness. A radiological examination revealed that Zero was pregnant. When asked if Zero had been involved with a man, Zero denied it.

The medical team had tracked Zero’s history and confirmed there were no traces of any male relationships.

The team continued their investigation. Who could have impregnated Zero? Surely this wasn’t a case like the Virgin Mary, nor could they attribute it to a stork.

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Genetic testing revealed that the fetus had an XZ chromosome pair. Had a woman impregnated Zero? Yet, as X chromosomes also exist in male sperm, this conclusion seemed premature.

But this revelation provided a lead. A hypothesis emerged that if a woman and a Z individual engaged in intercourse, Z might become pregnant.

It turned out that Zero had indeed been with a woman. Upon examining the woman’s body fluids, the team confirmed that she possessed the ability to impregnate a Z.

It was now understood that gender Z could receive genetic material from a woman, revealing more about this new gender.

But the story did not end there.

An astonishing report surfaced of a man who had become pregnant. Upon investigation, it was revealed that he had been with Zero.

After examining Zero’s bodily fluids, it was confirmed that Zero had the capability to impregnate a man.

Men everywhere faced the shocking new reality of their potential to conceive, a fact that brought widespread anxiety. To make matters more daunting, Z individuals were physically stronger than men. Needless to say, society’s norms had been turned upside down.

Thirty years after Zero’s birth, Z babies started to be born across the globe. The population ratio of males, females, and Zs was now approximately 33% each.

When Zero was born, Z was considered an exception under the law, but due to the rapid population growth, civil codes worldwide were amended. Many outdated laws, some long criticized as unjust, were revised or eliminated in legislative discussions.

As more time passed, Z individuals reached reproductive age, and love took on new forms.

Thus, triangular marriages between a man, a woman, and a Z partner emerged. This new form of love even included scenarios where all three partners could become pregnant. What was once called a “3P” (three-person relationship), viewed as abnormal, became common.

The number three has historically held a mystical power to simplify and balance structures, from the separation of powers and love triangles to elemental strengths in role-playing games like fire, water, and grass, or rock-paper-scissors.

And so, a new era of romantic interplay among men, women, and Zs began, each keeping the others in check in this unprecedented love game.