There is a legend in Japan that if one eats the flesh of a mermaid, one will become immortal. This anime recounts the story of Yuhta and Mana, an immortal boy and girl, and their experiences with a family struggling to achieve immortality at any cost.

Koichi Yamaderaas Yuta (voice)
Minami Takayamaas Mana (voice)
Mika Doias Towa Kannagi (voice)
Ryuji Saikachias Dr. Shiina (voice)
Kazumi Tanakaas Shiina (young) (voice)
Wakana Yamazakias Sawa Kannagi (young) (voice)
Ginzo Matsuoas Barker (voice)
Toshio Kobayashias Soldier A (voice)
Hikaru Midorikawaas Soldier B (voice)