Lilith, a devil, has an affair with an angel and ends up getting pregnant. She gives birth to twin daughters. Alita, the eldest, is born with more angelic blood and is given up for adoption. Kira, the little sister, is born with more devil blood and is raised by Lilith. They have never met or known about each other. Until Saya, a seven-year-old devil, is befriended by Alita. When Saya learns that Alita is an angel, she leaves her. While traveling north, she discovers a girl, Kira, that is identical to Alita but is a devil, killing an angel in the park. Saya follows her back to her...

Lilith, a devil, has an affair with an angel and ends up getting pregnant. She gives birth to twin daughters. Alita, the eldest, is born with more angelic blood and is given up for adoption. Kira, the little sister, is born with more devil blood and is raised by Lilith. They have never met or known about each other. Until Saya, a seven-year-old devil, is befriended by Alita. When Saya learns that Alita is an angel, she leaves her. While traveling north, she discovers a girl, Kira, that is identical to Alita but is a devil, killing an angel in the park. Saya follows her back to her...