It's a manga. The heroine has red hair, when she was a kid she got isekai into another world. Set in the past and there was a dragon god. Anyway she's a japanese kid when she got transported and the dragon god can transform into a human. She was supposed to be sacrificed but he spared her??????? (not sure of this one) He has white long hair.... I only read the first 2-3 chapters years ago so I can't say more than this.
It's a manga. The heroine has red hair, when she was a kid she got isekai into another world. Set in the past and there was a dragon god. Anyway she's a japanese kid when she got transported and the dragon god can transform into a human. She was supposed to be sacrificed but he spared her??????? (not sure of this one) He has white long hair.... I only read the first 2-3 chapters years ago so I can't say more than this.