The group splits up to find this Seireitou, with Ryun ultimately running into the half demon. She says that they cannot go to the past without him, as that would change things. However, she quickly takes it back when she realizes that a seventh member is missing, named Seireitou, a half demon. The six go visit the old Pan, who readily agrees to allow the young Saiyans to go to the past, as she in fact remembers their appearance many years ago.

Then he says that they should go ask Pan for permission to travel to the past. After hearing their names, however, Goku Jr. After watching their power, they too are recruited. They come across Ryun and Tora, who are sparring. Trunks and Gohan then sense high energy levels coming from a nearby forest, and the four go to investigate. They realize that they are Saiyans due to their resemblance to their ancestors, and after learning that they can both reach Super Saiyan, Trunks and Gohan explain their situation and ask for their help, to which they agree.

The first people they encounter are Goku Jr. However, since there was nobody strong enough in the past to recruit, Future Trunks and Future Gohan instead decide to travel to the future, shortly after the events of GT's conclusion. With modifications that had been made to the time machine, they could fit up to 7, and they could avoid creating alternate timelines by locking onto the main timeline specifically.

So Future Trunks and Future Gohan offer to find some with the time machine. Soon, however, a new threat is discovered, that the Z Fighters would have to recruit some help for. They would stick around and generally have a good time for a bit, with fun moments like Future Gohan being surprised that his counterpart became a scholar. One day, Future Trunks and Future Gohan would arrive in the time machine, to see how things had been going in the main timeline (for the record, this would consider Dragon Ball Z: Shin Budokai - Another Road to be canon). In this Saga, AF begins, around 1 or 2 years after GT's conclusion.

Dragon ball z af.com