Son Goku Jr., the great-great-grandson of the famed martial artist Son Goku, lacks the courageous spirit of his ancestor. He often finds himself the target of bullies at school, causing his grandmother Pan to worry for him. Despite not being a formidable Saiyan, Goku Jr. possesses a kind heart, which Pan cherishes deeply. When Pan falls ill, Goku Jr. realizes he must take action to save her. He recalls the legends surrounding the Dragon Balls, which are said to grant a wish to their holder—something he desperately needs at this moment.