The Name of God

Sengoku was a period when Japan was in war, a period when humans were still able to communicate with gods. Young Sarutahiko has died because of the struggle, but he will be resurrected and turn into an immortal thanks to a god's power, in exchange for consuming his sister's life day by day. To save her, Sarutahiko goes to ask for help from the god of the mountain, but instead, he meets a beautiful young girl… What is the true identity of this girl? What kind of god is capable of granting wishes in exchange for souls, blood, and death…?!