The time I was fused with my cat and sent into the Dragon Ball world

Future History, Part 3

It began with explosions and death. We gathered, and many fell. Vegeta, Tien, Krillin, Piccolo. Somehow, even Goku. I was able to save Gohan and initiate the plan. Everyone on earth that hasn't been hit by attacks yet is suddenly teleported to either Yardrat, Namek, or Cereal. Snake and Gato are safe on Yardrat, so I teleport there with Gohan. Rushing over, I make sure they're unharmed, then hug them. Chi-Chi rushes to Gohan, holding him close as Ox-King joins the embrace. Everyone we could save is protected. Using what little life remains on earth that's in hiding to go back and forth for the next 8 years, me and Gohan become mentor and father figures to Trunks, teaching him the ropes of Super Saiyan. Fighting the Androids to protect who remains on earth was hell, and I mean it. Unfortunately, we lost someone.
"Let me fight with you two, please! I can help!" Young Trunks pleads, genuinely wanting to help. Me and Gohan look at him with concern, but I notice Gohan smile.
"Sure, you can help Trunks." Gohan responds, calm on the surface and putting on an illusion. Before Trunks can fly, Gohan chops him on the neck, knocking him unconscious. I look at him.
"I'll train him well, Gohan. I know I can't stop you, but know this. You die if you fight here. He'll be the last Super Saiyan in this timeline, but he'll win. We'll win. We'll save everyone." I tell and reassure Gohan as he nods and takes to city, for his final battle. What happens next...

We all know.

Cries of rage.

Fury.

Rain.

Thunder.

A single man laying lifeless in a puddle.

Gohan is dead.

A flash of golden. I witness Trunks awaken Super Saiyan, and can't look him in the eyes. I let this happen. "Go home, Trunks...I'll handle burying him." I solemnly tell Trunks. He looks at me, not wanting to leave, but nods and takes off. Now alone, I'm silent for a moment.

A primal cry, screaming of rage.

"Even after all this, I'm still unable to prevent THIS?! What a hell to live in...why? Why did I agree to what he said? WHY DID I NOT PREPARE EVERYONE SOONER?! WHY THE FUCK AM I THE ONE TO BE UNABLE TO INTERVENE AS EVERYONE DIES AROUND ME?!" My questions are left unanswered, as I let myself cry alone, burying Gohan. A friend. A brother in arms to me. Someone...who is now dead.