Two siblings from entirely different upbringings are brought together through the World Martial Arts Tournament. In the fateful final fight they face off, and after their brief battle the two leave the arena, albeit not on the best of terms. Shu and Takeshi, with some strain on the latter's part begin to travel about together in order to train. In their travels they meet a renowned martial arts instructor named Master Roshi, hoping that he can help Shu learn to use his innate Ki abilities as well as he should. A training regiment unlike what either had ever experienced was started, and through this unusual course they soon made a friend in a young woman named Yumi. Together with their new-found friend they complete their rudimentary Ki training. With no further plans for themselves the boys resolve to remain on the island for a while longer, as does Yumi with no other place to really call home. It is during their stay that talk of their mothers surface, both boys not having any real knowledge of the woman who had borne them. Takeshi forms a plan with the help of Roshi, one that will grant them their desires to meet their mothers face to face. On the very next day the trio departs to find the Dragonballs, seven magic orbs that when gathered can grant the wish of whoever collected them. Finding every one though will not be as easy as they had hoped, as they'd soon find out.

It became quickly apparent to the friends that in order to locate all seven Dragonballs they needed some kind of help. Thankfully for the brothers Yumi has a proposal for their problem. Under her suggestion they seek out a childhood friend of hers, a young man named Vegeta, and no less the man in charge of the Capsule Corp. With renewed hope they make way to the massive corporation's headquarters, only to find that there has been a rather unexpected turn of events. A member of Capsule Corp, or more precisely Vegeta's personal guard, Viral the Beastman, has attacked the lab and is trying to escape with a Dragonball in his clutches. Believing that he is stealing one of their treasures Takeshi moves on in pursuit with Yumi and Shu none too far behind. The two have a chase and battle briefly, and as the others catch up to the group as does Vegeta. Obviously not pleased with what had happened Vegeta demands the return of the Dragonball initially, changing his orders when he learns of the brother's quest. Viral is none too thrilled to say the least, but accompanies the group on a search for their goal of collecting the Dragonballs. With an ingrained ability to locate them Viral becomes a key component of the group, and rather quickly proves himself to be rather helpful in many other ways as well.

Now four strong the group begins a quest for finding all seven Dragonballs again, this time with a means of collecting them. Unbeknownst to anyone involved it is not as simple as finding the Dragonball lying in a crack or crevice. Unlike the traditional hunts that they expected the Dragonballs have now been left in the care of guardians; powerful Earth warriors that are capable of keeping them safe from all but the most capable fighters. Several challenges were faced, from frozen mountain peaks to harsh deserts and dense, humid jungles, they traveled much of the globe in their hunt. It took the better part of half a year, but eventually all but one of the Dragonballs were in their possession. The brothers were one step closer to achieving their goals, finally getting to meet their mothers as they had so desperately dreamed of. As fate would have it however it was not to be, as dark forces loomed over the Earth. With the help of Goku they are whisked away back to East City, removed from their adventures to be thrown into a fight for the safety of their home against their father's men. In a desperate struggle against three powerful foes the group begins to lose ground, unable to conquer the overwhelming odds. When Yumi is injured though both boys become enraged, tapping into wells of strength and finally managing to gain the upper hand on the Saiyans, defeating all but the leader Krom. With his life spared Krom flees from Earth, but not before taking Viral with him.

From there things turned from bad to worse quickly. Despite having a hard fought battle the Dragonballs are gathered in hopes of bringing Viral back to Earth. As a means of protecting the planet and their friends from further harm Takeshi forms a plan, deciding not to speak of it until they've gathered all seven Dragonballs. Right at the moment of the wish he changes the plan, having himself and Shu taken to Viral's location to save him on their own. What looked to be a sound plan initially began to crumble almost instantly, and despite freeing Viral they cannot escape. The trio makes it to the hangar only to be confronted by Krom and a mass of Saiyan warriors with him. To make matters worse there is one more foe in their midst, the Saiyan King Yamate, their father. With absolutely no hope of defying the king or fleeing all three are taken into custody. Takeshi is forced into servitude under his father, taking on a squad of his own to carry out missions. He is the fortunate one of the group. Shu and Viral meanwhile are each taken to labs and subjected to horrendous tests to experiment with their unique abilities. A year passes in this manner, the brothers fall out of contact almost completely and Viral is completely thrown to the darkness and never heard from. Earth begins to recover thanks to the help of the Dragonballs, Yumi and Vegeta force themselves to go on despite their friends being gone, and life for Earth gets back to normal at least.

With all hope seeming lost finally a day comes when Takeshi decides to take a massive risk; free himself and Shu of their father's control. In a sketchy mission they depart as a squad with Shu in tow to a planet in order to put down a recent uprising of forces. They arrive and are confronted by a group of aliens, but nothing that should cause alarm for the Saiyans. They are confused, but following orders everyone sans Shu takes up arms and begins to fight. The true reason for their task becomes apparent as the rebels they were fighting draw back and a new foe shows themselves to the young Saiyans. Much to their surprise it is one of their own, an older Saiyan by the name of Korian. After a brief exchange a fight breaks out again, but this time it is heavily one sided in the favor of the rebels. Shu, under the control of a collar like device, transforms and attacks the rogue Saiyan. Even in his form though Korian overpowers the boy, destroying the device and freeing him from it, and the king's hold. Being the opening they were looking for Takeshi calls for a cease-fire, and after negotiations the brothers decide to stay with the rebels as the squad returns to duty under the promise they soon too would be freed from Yamate's hold.

Innumerable things have happened since the brothers were reunited. They joined the rebellion and, for the first time in over a year once again took up arms against their father. One mission led to a desert world known as Shaharia, and upon this world they encounter Viral, under the power of a similar device. After freeing the Beastman, albeit with complications, they return to the rebel home world of Uuonoe and regroup before continuing on with their push against the Saiyan forces. A succession of battles finally leads to the rebels taking the offensive, but not before a surprising turn of events takes place and Vegeta rejoins them as well. Striking out against a communications outpost on a frozen tundra of a planet they make the first step in taking down the Saiyan war machine. Here they find yet another surprise waiting for them, their friend Yumi who had since been taken by the Saiyans and turned Beastman as well. She is saved, the base taken over, though a rift between the reunited group and Korian's rebellion quickly forms after Viral slays a few enemies. Unable to see eye to eye any longer they do the only thing left to them; leave the rebellion and travel on their own. The party, with the aid of a ship given to them by Sayomi, makes a trip to a quiet little world known as Kaesstra. Despite being relatively detached from the rest of the universe war has marred this world too, though this fighting is amongst its own people. Needing help for Viral and temporary refuge the group stays here as Takeshi and Shu end up playing part in the conflict. 

With the conflict still playing out the story continues...