The Lost Fea MermaidDemon Slayer x Male oc (boy x boy Fanfic)

Where am I? said Fuji
That is the first thing, Fuji Kane said, as he realized he was not in his underwater castle at all. He realized that he was nowhere near home trapped in another universe, and the only way back home was to help defeat the great evil that roamed this era.
He will turn his tail into legs but he will keep his wings.