Kyouko is the 16-year-old princess of the world in the 30th century. She will soon become queen, but if this happens, she must quit school, which she does not want to do. (No one at school knows that she is the princess.) Because of this, she begins a search for the god stones to wake her twin sister Ui.

At the beginning of the series, she is a selfish and naive girl, but becomes friendlier with time.

She is the Time Stranger and uses the "Time Scorpion Cane" to travel through the time and also stop time.

Her real father is the time god Chronos, who was too weak to bring up his daughter, so he asked the king of Earth to lend Ui's body to Kyoko, and bring her up until she is 16. That also means Kyoko is the future time queen.

When Kyoko wakes up Ui, Ui's consciousness returns to her body. This causes Kyoko to have no body anymore and for everyone to forget about her. Then, Sakataki remembers her and makes everyone remember her too. Sakataki goes to the end of time (which is Kyoko's real home). Chronos tries to kill Sakataki, but Kyoko goes against him. Then, Chronos says that Kyoko is still a child and must grow up. Due to this, he lets Kyoko live on Earth, but Kyoko did still not have a body. The King then lent his wife's (Kiyu, Ui's mother) body to Kyoko. Kyoko and Sakataki get married, but Kyoko still writes letters to Chronos.