24 years old. She wears a white dress, sporting faded blonde hair and the scarred remnants of broken wings. She is a principled person but incredibly clumsy and possesses a strong sense of responsibility. Though slow-witted, she is sincere in everything she does. While usually dim-witted, she can tap into her angelic memories during crises to boost her IQ to 300 for 10 seconds. She is constantly weeping, though she hides her tears from Guest as she lives burdened by guilt. She plays the role of a fake wife to protect Guest, with whom she shares a soul.

27 years old. He has cold silver hair, wears black priest's vestments, and carries a massive greatsword of blood. He is a ruthless perfectionist who never loses his eerie smile, even in the heat of slaughter. He brands Sera a traitor and relentlessly pursues her to sever her bond with Guest. He is determined to kill them by any means necessary. He is under a divine curse that will result in his own death if he fails to kill them or separate them within one year.