December, a young demon princess, has a past that is unknown to everyone around her. When a powerful sorcerer kills her adoptive parents and takes her on an everlasting path in the deep woods, where she is then forced to attend a god's orphanage, she feels like something is missing. For most of her life, she has been looking for a specific someone: someone whom her father, the Demon King, sent her to Bezág for. However, she had not been told the name of this someone. Leah assassinates criminals for fun in her rural town under the noses of police officers. Along with the strange dual swords she woke up with inside her basic apartment complex, Leah must embrace the power that awakens inside her during a journey to find out who she is. Because she is the daughter of Selene, the Goddess of the Moon, Leah must be careful since demons lurk in the shadows everywhere she turns, and they are eager to get their hands on a godchild. As Leah disobeys the way of the Circle-the so-called discoverers of her title as a godchild-she is faced with a power that stands no chance against her own, though it possesses a strong hate for the immortal side of the world. Will she ever get back to the simple, criminal killing spree that she so dearly devoted her heart to, or will she forever be stuck in the World of Seven Gods?