The Water Dragon's Bride

The Water Dragon's Bride (水神の生贄, Suijin no Hanayome) is a fantasy shojo manga by Rei Toma. It began serialization in the manga anthology Cheese! in February 2015. Viz Media has licensed it for release in English.

Plot
Young modern-day girl Asahi is sucked away from her happy home to a strange and mysterious world. There, she is taken in by a clan that sacrifices her to a water dragon god as a bride.

Official
Official English site