"What does it mean to be ethereal?"   Kane is a member of the Athreal of Steel, eager to prove himself worthy by trying his luck in the Destiny's Conondrum. Through this he learns secrets that entail the destruction of all the Athreals. Vivian is a member of the Athreal of War, the prodigy that successfully went through the Destiny's Conondrum. Now in search of greater worlds, her journey leads her through divinity. Aurora is Vivian's sister and a member of the Athreal of Peace. Living under her sister's shadow and regarded as a "cursed child" she finds friendship with Kane and through it discovers her true purpose.