In the endless depths of the ocean, Luna Hoshira swims alone...exhausted, searching, convinced she's the last of her kind. Every trench, every reef, every dark current has led her only to silence... until she collapses into a sleep deeper than the tide itself.When she wakes, she's not alone.Storm-grey eyes watch her from the shadows of the deep. A merman...Ryu Kaien...strong, commanding, and impossibly real. He offers her safety in a world that has only ever given her loss. He knows currents she cannot see, and secrets she has never dared to believe.But the ocean is not just salt and water. It is memory, danger, and song. As Luna is drawn into Ryu's hidden world...tribes long forgotten, sirens who wear the faces of the dead, and a moon that glows beneath the waves...she must decide whether to trust the stranger who saved her... or risk being swept away by the very longing she's chased for so long.