It was over. The Red Ribbon Army had been defeated despite the fact that that hadn't been what Goku had set out to do when he'd gone in search of his Grandfather Ball. The Dragon Balls had been gathered, and a wish had been made. Young Oopa who lost his father due to the actions of one of the Red Ribbon Army's mercenaries would not have to go through that pain for the rest of his life as the man had been restored to this world.
As Goku watched Oopa run to his revived father, a strange feeling stirred in his chest. He didn't quite know what it was, but it hurt. He tried to keep a happy face when he caught his grandfather's ball and said goodbye to his new friend - after all, he should be happy for him - but some of the feeling leaked through.
Oopa's father's heart hurt slightly as he watched the boy who had helped his son depart. The boy with the wild black hair had an open and smiling face, but such sad eyes.
"Does Goku have a family?" Oopa's father asked the diminutive boy sitting happily on his shoulder.
"He had a grandpa, but he died." Oopa replied.
It was then that Oopa's father realized how selfless Goku had been when he had given Oopa the wish that had restored him to life. The boy could have taken it for himself and revived his departed grandfather, but he had given Oopa the wish that brought him back instead.
"If everyone was half as giving as Goku, the world would be a much better place." Oopa's father said, watching the spot of sky that Goku had departed from. "We can only hope to follow his example."
"I'll do my best father." Oopa said smiling as he thought of his friend.
When Goku got back to the others, he asked Master Roshi about the strange feeling he had experienced while watching Oopa and his father. Apparently, according to the consensus formed by the group, what he had felt was called Jealousy, and he felt that way because he wanted a father too despite the fact that his had quite likely abandoned him in the wild where his Grandpa had found him. Since Oopa had gotten his father back with the Dragon Balls, he knew that could get a father of his own with them too. Maybe this time his father wouldn't abandon him, or he'd find out that it had been an accident. He'd forgotten things before and gone back to get them only to find that they were gone. Maybe, that had been what had happened to him.
He had a year before the Dragon Balls could be used and he could get his father back and find out where and why he'd been gone though.
Since he couldn't think of anything else to do until then, he decided to use that time to train for the next Tenkaichi Budokai until it was time to search once more as his teacher had suggested.