After dropping his Super Saiyan 7 transformation, Son Goku left the Hyperbolic Time Chamber, used Instant Transmission to return home, and went to spend some quality time with Bulma, Chi-Chi, and Lazuli.
The next day, Son Goku resumed his simple, unadorned, and tedious training routine.
His life revolved around three places: a black hole, his home, and the God of Destruction Realm.
At the black hole, Son Goku trained in his base form. After enduring the onslaught of destruction energy, a mere ten billion times normal gravity could no longer harm him in that form.
A year later, Son Goku had just returned from training and was eating at home when he suddenly sensed an evil presence. He went outside and saw Goku Black hovering above an open patch of ground, surveying his surroundings.
Son Goku smiled. "Goku Black, you passed up the road to heaven and forced your way into hell. You're dead today. No one can save you, and you have my word on that."
"Son Goku, I never expected you to still be alive," Goku Black said. "Excellent. I can kill you all over again."
Before he could finish, Son Goku kicked him into the sky.
Goku Black steadied himself. "Not bad, Son Goku. The stronger you are, the more excited I get."
The instant he finished speaking, Son Goku appeared in front of him, aimed his palm at him, and growled, "Destruction."
A blast of dark purple energy struck Goku Black, and he screamed, "Ah! How is this possible?"
Then his body was annihilated inch by inch, dissolving into nothingness.
Son Goku spat. "What a piece of trash." Then he returned home.
Having noticed the commotion, everyone hurried over.
"Kakarot, what happened?" Raditz asked.
"Goku Black showed up," Son Goku said.
"Where is he? Where