(from ebookjapan):
One day, a fireball suddenly fell. In order to protect people from the monster that appeared from it, Momotaro becomes Flash Z and decides to fight together with his robot partner, Apollo! The Z aliens who attacked the human race are plotting to conquer the earth. They had been secretly carrying out a plan to conquer the earth long before ....... This science fiction action story was published in "Manga King" and "Elementary School Gaho" from 1960 to 1961. The bangai-hen (extra arc) "Time Patrol" is also included.