The film is about the daily life of a group of six very different strangers who, for scientific purposes, are brainwashed into believing that they are a family.
The family is filmed and to recoup scientific expenses the distribution rights for the footage are sold to a television station for broadcast as a domestic soap opera called Eternal Family.
The show becomes highly popular in the outside world so when a plumbing disaster results in the family accidentally escaping, the television station and the residents of Champon City spare no expense to retrieve them.
Eternal Family represents Sato's debut as an anime screenwriter, and Morimoto's first foray into the field of broadcast media.
The storyline follows an actor named Ben and a group of six unrelated men and women who have been implanted with false memories that they are his family.