Ni-hiki no Sanma (1968)

Remake of the 1960 film with the same name in color that tells the story of a man and a woman who go by raft to a remote desert island with chickens and a dog. At first, it is a kind of paradise for them. They farm and fish following the same routine every day, feasting on grilled sanma that they roast out in the open.

One day, their harmony gets interrupted by a mustachioed scientist on a raft powered by an abused pig. This unwanted visitor constructs a robot which begins the process of industrialization on the island. The couple are disgruntled but decide to put up with the man and his technology.

(Source: AniList.co)