Aria- those who have the affinity for the element of air. Erde- those who have the affinity for the element of earth. Hudōr-those who have the affinity for the element of water. Fȳr-those who have the affinity for the element of fire. That's what her mother told Lillian about Aethers when she discovered that she's one of them. Sent to the Academy, she finds out that there's much more to it. Follow her as she makes new friends. Argues with a boy who makes the usually calm girl want to pull her hair out. And learn more about herself than she ever imagined. But as enemies emerge and secrets unravel; Lillian and her friends must get ready to face much more than what they bargained for.

Stranded on a parallel Earth, the Tenth Doctor finds himself mentoring a traumatized child soldier enlisted in a hopeless war to save humanity. With an endless number of mysteries in sight -- from the enigmatic alien invaders they call Angels, to the strange machines known as Evangelions used in the planet's defense, to the shadowy maneuvers of those in power -- the Doctor is drawn deeper and deeper into a web of mistakes and sins that threaten to consume all humankind. In time, he'll face the darkest question of them all: what if there are some worlds -- and some children -- even the Doctor can't save?