THE WATER DRAGON'S BRIDE (Suijin no Hanayome), by Rei Toma. First published in 2015 and first published in North America in 2017.
PLOT:
Asahi was just playing in her parents' yard when she's whisked into the pond and transported to a realm that's many hundreds of years before her own. Initially she is saved by a young boy from the village, but the rest of the village sees her as an outsider who will do as a sacrifice to the water dragon in the lake. Now she is trapped in the realm of the water dragon who has little interest in humanity, much less a bride, desperate to simply go home.
