Disclaimer: Harry Potter is owned by J.K. Rowling, and Akame ga Kill is owned by Takahiro and Tetsuya Tashiro. I own nothing.
The European governments were gone. There was now the empire. This empire had developed weapons of war known as Imperial Arms and their wielders were nearly unbeatable, well except to another Arms user.
The corrupt Prime Minister to the empire Honest had been slain by the revolutionary army and the young emperor was now advised by General Najenda of Night Raid, General Esdeath, who had been pardoned by the Emperor, and Great General Budo. For the most part peace had found its way into the empire. Or so many thought.
Akame was doing her nightly patrols of a neighborhood just outside of the capital when she heard a faint yelp from one of the houses on the street. Number four it looked like.
As she approached she looked through the living room window and saw a small boy cowering before a walrus of a man. She saw the walrus kick the child in the ribs and her vision turned as red as her eyes.
With her lightning speed she kicked the door down, unsheathed her Murasame and cut the man on his neck.
The man did not even process her presence until he felt his heart give out and his skin began to get covered in Japanese writing as an effect of the cursed blade.
Akame heard a shrill yell from the kitchen and saw a horse faced woman pass out from shock.
With both of the residents down she turned her gaze toward the boy on the floor.
"Are you okay?" Akame asked.
The boy looked up at her and Akame saw beautiful emerald green eyes. A complete opposite to her ruby iris'. Almost Just like Tatsumi's forest green eyes.
"I guess," he said with a sob. "Who are you? What did you do to Uncle Vernon?"
Akame was appalled to believe that the man who had been beating this child was a relative of his.
"My name is Akame, and I killed him."
"But you'll get in trouble!" the boy told her.
"I work for the government I can get away with pretty much anything," Akame replied stoic
"But killing is wrong," the boy argued.
"For the most part yes, but if someone is hurting you or is trying to kill you, you have every right to kill them first," Akame told him.
The boy shut up and stared at his feet. "What happens now?" he asked.
"Well you can stay here which I advise against, or you can return to the capital with me," Akame told him.
"What will happen to me there?" the boy asked.
"What's your name?" Akame asked him.
"Harry," Harry told her.
"You'll have a family Harry," Akame answered as she extended her hand to Harry.
Harry took it and left the house with Akame and headed for the capital where he would meet his new family.
Back at Hogwarts in Dumbledore's office many of the instruments monitored to Harry Potter's person were going off.
Dumbledore checked to make sure the blood wards were still intact which they were, but it appeared that there was a break in at his house.
The headmaster used the floo network to travel to Mrs. Figgs house and then walked across the street to number four Privet Drive. To his great discomfort he saw that the door had been thrown off of its hinges.
Dumbledore entered the house and saw the body of Vernon Dursley lying dead on the floor of the living room. Dursley's neck had a cut on it, but what concerned him the most were the strange marking covering his body. They looked to be Japanese, but he couldn't tell for sure.
He had to find out what happened here. Going over to the limp form of Petunia Dursley he cast an awakening charm on her.
As soon as Petunia came to she shouted, "You! What have you and your lot done now?! My husband is dead because of your lot!"
Dumbledore wasn't supposed to use legintimency on muggles, but he had to find out what happened to Harry and where he was. As he probed Petunia's mind he saw the door flying off its hinges as a streak of black raven hair moved into the house and cut Vernon on his neck. Soon after the markings appeared on him and he collapsed, dead. Then Petunia herself fainted, ending the memory.
As Dumbledore left her mind, he obliterated any memory of him being here tonight as he left the house fuming.
Harry was vital to his plans, he needed to be found and returned to his home. Whoever that woman was she probably had Harry. She was clearly dark and powerful to possess a sword like that. Dumbledore needed to get Harry back from her to ensure that the Wizarding World got their savior back.