Sakana to Mizu no Mori

But for them, love was still a ways away...

Vahn, formerly one of the Mer-people, lost his home, his family, and his voice, and now works as a slave of a manor in a harbor town. On the day of the new moon, he meeds Yeans, the only inhabitant of the cursed island of Fisca. He was the kindest and most considerate man Vahn ever met. And after spending time together, sharing meals together, Yeans proposes to buy Vahn out of slavery.

But in order to enter the island I live, you'd need to become my companion...