At the end of Stars, Usagi instead chooses to be with Seiya. Mamoru takes this with good grace and wishes them a happy future. Usagi and Seiya stay together for 5 years, until the Earth enters it's great Ice Age. then in the 30th century, Usagi unfreezes the Earth. At this point, she and Seiya go to the Moon, while Mamoru becomes the king of Earth. During those 5 years before the Ice Age, he began a relationship with Setsuna, and proposed shortly before he became king. The two kingdoms live peacefully side by side, and the two couples get alone relatively well, though they do not see each other very often.

Now it's 11 years later, and both couples have a 10 year old daughter. Endymion and Setsuna have what would be "canon Chibiusa", with pink hair and red eyes, though now she has a different name and is solely the senshi of Earth. Usagi and Seiya have their own daughter, who is the senshi of the Moon. Both girls get along well, not knowing the other's father and mother were once a couple. But in this time of peace, a new threat has emerged. A woman calling herself Queen Morganite, the daughter of Queen Beryl and the rightful ruler of the Earth! And now after so many years, the seperate royal couples, the princesses and the senshi must band together to find and stop her!

Morganite is the daughter of Beryl in that she is only a genetic clone created by Metallia, and you can decide if she is obsessed with Endymion or not, and what she looks like(black or red hair, so forth). Usagi and Mamoru are still friends despite having different spouses.