The Merchant Mermaid and the Azure Sky's First Love

Shara, a mermaid living in modern times, has been trading with yokai and humans as a 'money changer.' To her, humans were merely customers. She never intended to open her heart to them. Then, one day, a mysterious handsome young man named Sora wandered into her miniature garden. He didn't seem like an enemy, but he had a secret, so Shara proposed a deal. However, the only thing Sora wanted was Shara herself?! A love romance of cohabitation, where love and secrets intertwine, begins with a 'deal'!