- Ho Yay / Foe Yay: Rain and Yuca were incredibly close friends, so much that Yuca made Rain immortal to save his life and to make sure they'd meet again when he was reborn. But Yuca also got all the orphans horribly killed, shot Freya in front of Rain and fed him her flesh, made a cruel bet with him, and then shot himself in the head, leaving Rain traumatized and alone for six centuries.
- May Fly December Romance: Rain is over 600 years old. Machika is 14. However, given his non-existent history with women and his eternal youth, it's easy to forget.
- Nightmare Fuel: Frequent.
- What Do You Mean, It's Not Symbolic?: Lord, where to begin. Rain wears a priests uniform, the immortal monsters that show up are referred to as angels, the metal plaque on Rain's chest is cross-shaped, Rain stabs an angel in the chest in the first volume with a cross-shaped branch, the way Freya's body is hung... I could go on.
- Also, the drug used to suppress angel blood is called ichor.
- Woobie: Rain and Yuca, for different reasons. Also Ayla, and Machika gets their moments.