Karas - S01

The world of humans and the world of demons (youkai) have overlapped, so humans walk the streets of life as they normally would, while demons walk the very same streets, hidden from the naked eye. A seemingly young woman named Yurine and her servant, the Karas (from the Japanese word for "Crow"),have long kept order and balance between the overlapped worlds, ultimately stopping the demons from disrupting human lives. But humans have come to forget and mock the existence of demons, and no longer understand what a privilege it is to live without fear. Disgusted by this arrogance, an old Karas turns his back on the laws he once upheld, and in his human form, named Eko, he builds an army of Mikura, or mechanized demons, to prepare an attack on the human race. A young man named Otoha inherits the powers of the Karas and takes his place at Yurine's side, who claims his soul called out to her while he lived the life of a human. They live in the world of the demons. It is now up to Otoha to prove himself as a Karas and restore the balance that Eko threatens to overturn. Meanwhile, a superstitious police officer named Sagisaka and his rational new recruit, Kure, follow the trail of the murders committed by Eko's Mikura, as well as the trail of a rogue Mikura named Nue. The prophecy unfolds from here into a grave revelation for everyone in the city.