Takahashi Rumiko Gekijou Ningyo no Mori
English title: Mermaid Forest
Japanese title: 高橋留美子劇場 人魚の森
Alternative titles: Mermaid Forest TV, Ningyo no Mori TV, Rumic Theater: Mermaid Forest
Type: TV
Source: Manga
Episodes: 11
Status: Finished Airing
Aired: Oct 5, 2003 to Dec 21, 2003
Broadcast: Sundays at 00:55 (JST)
Duration: 24 min per ep
Rating: R - 17+ (violence & profanity)
Studios: TMS Entertainment
Producers: TV Tokyo
Licensors: Geneon Entertainment USA
Genres: Drama, Fantasy, Horror, Mystery
Demographics: Shounen

According to an ancient legend, mermaid's flesh can grant immortality if eaten. 500 years ago, Yuta unknowingly ate a piece of mermaid's flesh. For centuries, he travels across Japan, hoping to find a mermaid, thinking she may be able to make him a normal human again. When he finally finds one, he discovers that she and her companions have been raising a girl to be their food so they can eat her and take on her youthful looks. That is how mermaids stay young. Yuta kills the mermaids and rescues her, but she has already eaten some of the mermaid's flesh. Although he had to kill the mermaids, Yuta isn't too disappointed. Yuta's once lonely existence is now over, as he has found a companion in Mana. And Mana, who had been trapped in a small hut her whole life, finds delight in even the simplest of things. Together, Yuta and Mana attempt to seek out more mermaids, trying to become normal humans again. 

(Source: ANN)