Atuale left the sea years ago to be with her lover, and now she must go to the stars to save him. With her ex. Who is a traveling Witch.

I love the worldbuilding in this one. Over the long years, humans got their genes modified into people that don't even seem like the same species anymore, but they still refer to themselves as humans, or human variants. Even if they have scales or fur or feathers. Also, the seadwelling subspecies can change sex under certain conditions. Since this is a feature of their species, it's not really being trans the way we understand it, but the way Yanja speaks about finally being in the right skin definitely feels like it.

I read this a long time ago and forgot enough of it that the ending hit me in the feels twice. That little italicized last bit is my favorite part of the whole thing. Sun-daughters, sea-daughters, indeed.