The story covers the time period up to Goku being sent to Earth, and marks the first appearance of Goku's mother Gine in the Dragon Ball franchise. 
 
This is a special manga featured in the collected volume of <a href="https://anilist.co/manga/84627/GingaPatrolJako">Jaco the Galactic Patrolman</a>
 
(Source: Wikia)

Retired scientist Omori lives alone on a deserted island while continuing his research into time-travel. His quiet life is interrupted when galactic patrolman Jaco crash-lands and decided to move in with him. Can Jaco get along with the old man long enough to save the earth from a dangerous threat?
 
Note: Includes the epilogue and 1 extra chapter.

Dragon Ball follows the adventures of Son Goku from his childhood through adulthood as he trains in martial arts and explores the world in search of the seven mystical orbs known as the Dragon Balls, which can summon a wish-granting dragon when gathered. Along his journey, Goku makes several friends and battles a wide variety of villains, many of whom also seek the Dragon Balls for their own desires. Along the way becoming the strongest warrior in the universe. 
Part II of Dragon Ball is also known as "Dragon Ball Z" in North America. 
Note: Chapter count includes 519 regular chapters and 1 extra. (Volume 33's "Trunks: The Story").

Earth is at peace after The Tournament of Power but Goku continues to train, knowing there are ever-stronger forces in the universe. With the arrival of a Saiyan warrior named Broly, Goku and Vegeta face their most dangerous challenge yet. The film also chronicles the history of the Saiyans and the background story of these three Saiyans with different destinies connected to the turbulent period of their now extinct race.

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