人魚シリーズ 人魚の森 人魚傷痕 夜叉の瞳
Called "Mermaid Saga" in English. 
A three-volume manga series by [[Takahashi Rumiko]]. 

h4. Characters 
* [[Kannagi Sawa]]
* [[mana_(ningyo_series)|Mana]]
* [[Natsume_(Ningyo_Series)|Natsume]]
* [[yuta_(ningyo_series)|Yuta]]
ningyo series