Head Over Tails by Brianna Tibbetts

Mermaids meet mental health in this light-hearted story of life, love, and learning to grow into who you were meant to be. Their love is true...but is it real? Fear of inheriting his father's hallucinations and memory loss have brought Jacob's life to a screeching halt at age nineteen. Now he spends his days alone on the beach behind his home, staring into the endless Hawaiian waves. Mermaid Sevencea is eager to explore life above the water--and cheer up the handsome, lonely young man strolling on the shores. Forming a bond with him is as natural as swimming. All she needs are legs to walk beside him, so Sevencea disappears to trade for the necessary magic. Yet when she returns, Jacob is gone, convinced she was a hallucination after all. And the more Sevencea searches for him, the more she doubts what they have will last. Can love truly exist between land and sea? A sweet mermaid-meets-human romance set within the lovely vistas of Hawaii.