From the Flames We Rise [Yullen]
Allen Walker is an exorcist who lives within the Black Order Society. However, he won't be able to live there much longer if he can't summon a shikigami and begin taking offers.
However, Head Chief Komui hadn't expected the seal of the ancient alter to be destroyed, and the wake of a powerful yet dangerous shikigami named Kanda Yuu.
And Allen hadn't expected to find himself caught up in an all out battle of life or death. Neither did the forbidden shikigami, Kanda.
But falling in love? Now that was the last thing anybody saw coming.