Shirohebi-sama no Hanayome

Overview

There's an island in the middle of a great river. It is said that on that island, one can find what they have lost... People who come by boat never return in the same direction. They find something and cross to the opposite shore. This is the story of a girl who runs a restaurant on the island and the young man who helps her. A Japanese-style fantasy full of surprises and emotions of people living in turbulent times. (Source: Gangan Online, translated)

Source: AniList