I do not own Yu Yu Hakusho, but if I did, it would have lasted longer than 112 episodes.

Yusuke has just returned from Genkai's training. He and Kuwabara sit on a bench near an ice cream stand, getting caught up.

"So do your arms bend in the right direction now?" Yusuke teases Kuwabara.

"Yeah, with Genkai's healing powers, I was only in bed for a day after the fight, and I think she even made me stronger. I could try them on you if you want!" Kuwabara challenges.
"Buddy, I'm afraid they'd send me to jail. After what I learned from the old lady, fighting you would be cruel," Yusuke replies honestly.

"So, was the training very hard?"
"I-wait, where's Kayko? You didn't invite her to come see me now that I'm back. Don't tell me she had a detention or something... her, yeah right."

Kuwabara stares at the ground, averting Yusuke's inquisitive look.

"What, what happened!?" Yusuke exclaims.

"She... She's dead." Kuwabara forces out.

"What!? NO! When? HOW!? Where? Why? That CAN'T be true! You fucking bastard, quit joking, where is she!?"

"I'm not joking... She was killed.."

"How!? Who!?"

"A demon..."

"This... This is all my fault..." tears start streaming down Yusuke's face "If I hadn't have left. If I hadn't have become spirit detective. If I had been there for her!"

"It's not your fault. There was nothing you could have done."

"You're wrong!" Yusuke slams his fist into Kuwabara's face and runs off.

Kuwabara is sprawled in a crater surrounded by pieces of what used to be a bench. He slowly gets up, rubbing the spot where Yusuke hit him. When he takes his hand away it is covered in blood. His uniform is shred to pieces and he is covered in wounds. He limps in the direction that he saw Yusuke ran. Blood seeps from countless holes caused by the blow and the explosion of the bench. As he walks, he painfully removes giant splinters from his body.

Yusuke dashes at inhuman speed through the streets. After going a few blocks, he notices someone staring in awe at him. "What the hell are you looking at?!" Yusuke yells.

"No-Nothing. How the Hell are you doing that you freak?"

"Fuck you!" Yusuke says as he jumps towards him, planting his foot in the man's face. Blood spurts from his mouth and nose as the man falls unconscious. Yusuke leaps off of the man's head, and continues running through the streets. He pulverizes two more pedestrians, and hurls countless people to the side.

After leaving a huge path of destruction in his wake, Yusuke finally stops in front of an arcade. He goes in and jumps into the car of the nearest racing game. He then proceeds to demolish all of the top scores in every game in the arcade. After running out of coins, he dashes out of the door, and straight into Kuwabara's arms.

"You've got to stop this! You're hurting innocent people!"

"What the hell does it matter? The only thing in the world that matters to me is gone!"

"What about me? I'm your friend. You don't care about me? What the hell am I supposed to do without you. One of these days I'm gonna beat you."

"Not even in your wildest dreams... I'm going home. Maybe I won't wake up tomorrow," Yusuke says as he walks off towards his house, leaving the injured Kuwabara behind. Kuwabara promptly collapses and is stuck in the street for several hours, until his sister finds him, and takes him back to their house.