She is a daughter of Toba Island's headman, but due to the headman's sickness, Rin has to take over his leadership. Rin has been searching for a mermaid to cure her father. By that time, she meets Yuta when he came back to life from a terrible battle he is in. Rin and Yuta fell in love each other and Yuta promised to stay in Toba Island if he has turned back into a mortal. Isago, the Sakagami headman's wife, wounded the Toba headman and makes Rin and Yuta to go back into a mermaid hunt. They found on but Rin has been captured before Yuta manages to save her. In the end, Rin and Yuta learned that Isago is a mermaid and they cannot be together due to Yuta's failure of asking a mermaid to grant him his mortality. Rin continues her father's leadership.