The Mirror of the Aether Rift

While exploring the library at Oxford College, a girl named Ailila discovers a mysterious mirror. In it, another version of herself appears, shrouded in shadow. At the same time, Kairan, a boy from the Stardust Federation, barges into her life with the Rift Blade, a weapon capable of cutting through worlds. Forced to transmigrate through seven worlds, the two search for the legendary Source Crystal Shards, which can repair the World Tree. But they become entangled in a plot by an ancient religious organization called the Eternal Ring. Its members intend to sacrifice the elves of all seven worlds and return the World Tree to chaos. As their adventure unfolds, Ailila gradually discovers that she is the Child of Prophecy, and that her fate, along with Kairan's, will determine the survival of every world.