Time Stranger Kyoko Vol 2

Time Stranger Kyoko Vol 2 by Arina Tanemura. A Shojo manga rated Older Teen, published in English by Viz Media.

In the far future, Kyoko is a princess who would much rather live as an ordinary high school girl. To claim the throne, she must gather twelve sacred stones to wake her twin sister Ui from a long sleep, in this fun sci-fi adventure from Arina Tanemura.