(WARNING: You probably already know this, but this is NOT the summary of Dragon Ball Super's Future Trunks/Goku Black arc. If you want to see the accurate story, please watch the arc in it's entirety. Thank you, and I hope you enjoy the story.)
Dragon Ball Super: Hope's Secret Weapon
Chapter 1: Awakening
As Trunks arrives in the future to get Goku and Vegeta to defeat Goku Black, everyone hears a loud crash nearby. Followed by an earthquake. "W-what the hell was that?!" said Trunks. Goku starts to run twords the crash sites and says "Come on guys! Let's check this out!" Everyone except for Vegeta follows Goku. "Father, aren't you coming?" Trunksn says. "I don't the time for these things! Let's just hurry the hell up and go!" Vegeta says. Trunks stares at Vegeta, while Vegeta stares back. Eventually, Vegeta finally says "Alright fine! But I'm only going because I'm tired of waiting!" Vegeta then follows Trunks and Goku to the site.
Once they arrive, they find what looks like a teenage boy out cold. He appears to have red hair that looked like Gohan's hair from the Cell Games, blue eyes, and...a saiyan tail. "Another surviving saiyan? But that's impossible, Planet Vegeta was destroyed by Frieza a long time ago!" Vegeta said.
Trunks then shaked the mysterious saiyan up and said "Hey, can you hear me? Are you okay?" The mysterious saiyan got up and looked his surroundings. "Wha-...What? Where am I?" the mysterious saiyan said. "We'll worry about that later. For now, can you tell us your name?" Goku said. The mysterious saiyan then said "Well, my memory is a little foggy, but I do remember my name. It's...Kanako Tagashi."
Chapter 1: Awakening
END