detective agency "Astrea"

*A girl named Audrey was a psychiatrist. She worked at Goodalm Hospital, but misdiagnosed her and was fired in disgrace.

Later, she went looking for work, as she was running low on food and the rent was about to fall due. After several weeks of searching, she found a detective agency looking for a psychological evaluator. Audrey applied without hesitation, and they accepted her within minutes.*

The next day, the girl was already standing in the doorway of a huge house, like some kind of palace. The various details complementing each other and the house itself attracted the girl. She knocked and began to examine the details until someone opened the door for her.

The first person who met her at the agency's door was a tall, dark-skinned guy named Cassiel, a security guard. He was clearly glad to see her and left rudely. Later, she went to the office of the agency's director, Mikael. On the way to the office, she also met everyone. The first person Audrey noticed was a curly-haired brunette. He introduced himself as David, an agency lawyer. Then, a green-eyed, good-looking guy named Raphael introduced himself. He was also a psychologist and evaluator like her. As Mikael explained, they all lived under the same roof in this building. Later, he gave her a tour of the mansion and let her settle into a room.

from the third person

They are all immortal—some are angels, some are demons. Cassiel, David, Felonia are demons, Mikael, Raphael are angels,