This is set fourteen years after the events of the Kyoto arc. Shishio has returned.
Chapter one: he's back
"Dammit Sano, your brother found us!" said Kenshin as he polished his newly crafted blade. In the past fourteen years, he has survived a number of fights, and killed no one. He has stuck to the virtues of the wanderer, that he has.
"I have no brother…" said Sano. "At least not since he fell prey to my hands. Fucking tapeworm."
"Haha, what's up Sano?" Said Yahiko. He was wearing a suit, getting ready for his interview as a lawyer. He's tired of fighting. Wants to protect the law.
Meanwhile…. In prison
"You want out?" Said a masked man. He was Makoto Shishio's cellmate, whose name remains a mystery, even to himself.
"Yeah, I want out. You got any way for me to do that?"
"Yeah." He hands him a vortex sword. "With this, you can travel through time."
"Thanks." Said Shishio. He took the Vortex sword and started slashing the air. A time rift was created, allowing him to travel through time. He traveled to the future when everyone in the prison was dead, including the guards. He was able to grab a rope that was chillaxing on the wall, he threw it at the key that the dead guard was holding, and grabbed the key. He unlocked the door and headed out the door. He slashed the air again with Vortex Sword and traveled back to present time.
"Here," he handed the masked man the Vortex Sword, and proceeded to leave the prison.
The guards noticed that he was out of jail.
"Get him!" the guards shouted, trying to get rid of Shishio.
"No use." He fought back and killed them in fourteen seconds.
He started walking toward Kaoru and Kenshin's house, blade in hand, anger in brain.