Mermaid Saga (人魚シリーズ, Ningyo Shirīzu?) is a series of manga graphic novels in three volumes by Japanese mangaka Rumiko Takahashi. Two of the stories from the series, Mermaid Forest and Mermaid's Scar, have been adapted as anime OVAs, and all of the tales, except one, were later produced as an anime TV series.

Source: Wikipedia