When Sorano Fuu was seven years old, she came home to find her parents dead. She was taken in by a group called Tenshi, who told her the truth: her parents had been Dealers, trading the illegal substance known as Hoshi, and they were killed for it. Fuu made a vow—to spend her life making amends for what they did. Now twenty, she works as a Tenshi protecting Akatsuki, a town in the Cloud region. The colleagues she works alongside all carry their own damage from Hoshi, and whether any of them can break free of the past is a question Fuu has stopped being able to ignore.