Wataru Hirayama's outwardly liberal views on marriage are severely tested when his daughter declares that she is in love with a coworker and is adamant to live life her own way, instead of agreeing to an arranged marriage. Outwitted by his female relatives, Hirayama stubbornly refuses to admit defeat.
The spaceship AAB-Gamma is dispatched from FAFC headquarters in Japan to make a landing on the planet Mars and investigate reports of UFOs in the area. As they near the red planet, they encounter a mysterious UFO that coats the ship's hull with unusual spores. Taking one of the specimens back to earth, it soon develops and grows into a giant chicken-lizard-alien monster that tramples Japan.
Matsugoro is a poor rickshaw driver whose animated spirit and optimistic demeanor make him a favorite of the town. Matsu helps an injured boy, Toshio, and is hired by the boy's parents.
