Dumbledore knew that, without Harry Potter, Voldemort would have no one to stop him. Sadly, Harry was dead, his soul missing from his body. If the boy had not went outside when Mundungus was on guard duty, he would still be alive. There was nothing they could do for Harry Potter, but soon, they will have a Harry Potter with them.

A ritual, one that Dumbledore found in the Black library, would summon a person from another world. All it took was some rune work and some personal belongings of the person. Dumbledore was certain that Harry would understand that he had to sacrifice his owl for the greatest effect. And then when the ritual was complete, Dumbledore gazed through the smoke, though he could make out three figures. Wait, three?

"So, this is the Dumbledore you speak of?" The one in the center spoke with a feminine and strong voice.

"Yeah, he must have used that 'Summon Harry Potter' spell." The one with the Potter's messy hair and a mask said. "Any bet that he screwed something up?"

"I'm more worried that the catalyst he used probably was something that the original treasured preciously." The one with blue hair adjusted his glasses. "So yours is a sucker's bet."

Dumbledore cleared his throat. "Excuse me, but which one of you two is Harry Potter?"

The boys looked at Satsuki. The wild-haired boy shrugged. "I think it's your turn, Lady Satsuki."

The boy with the glasses stopped Dumbledore before he could speak. "You have to accept the possibility that there are different worlds that have Dumbledores in them. Uzu was summoned by a magical cup to compete in a tournament while I was summoned to fight a war. In both occasions, the one known as Harry Potter died early on as a result of you leaving the boy with his relatives."

"No, Harry died from the Dementor's Kiss because he did not stay in his relative's house." The glares he got from the three kids said they believed otherwise. "However, we did happen to have the Triwizard Tournament last year, and Harry was forced to compete in it. As a result, his blood was used to resurrect Voldemort, though our ministry denies his return. Only Harry..."

"He has to defeat Voldemort because of a prophecy." The blue one interrupted him. "Don't worry, your other self did not tell us either, but we figured that you and this dark lord have to believe that Harry must be involved."

"...Yes, there is a prophecy, but I cannot say it in fear that Voldemort may hear of it." Nevermind that Voldemort knows the part that marked Harry as a target. "Well the, I will introduce you as students of Hogwarts..."

"Excuse us, but is Voldemort teaching in school?" Satsuki asked. "I believe you summoned us to fight Voldemort, not to replace a dead boy whose purpose was to fight him."

"Miss Potter..." Dumbledore explained.

"Miss Kiryuin." Satsuki told him.

"Ah, Miss Kiryuin. I'm afraid that Voldemort is not simple to defeat, which is why I ask you to go with my plan by attending Hogwarts..."

The messy-haired boy snickered. "We got summoned into the magical world and fought him. I mean, I got rid of my snake after he rezzed and summoned his little minions, and glasses here got rid of his version in one month after you guys fought the war for five years. I have no doubt that Lady Satsuki, who can kick our asses, is more than capable for the job."

"Nevertheless, you must attend Hogwarts." Dumbledore told them. "Since he is not attacking in public, you do not have to worry about fighting him now."

The kid with glasses snarked. "Though I believe the time he used in hiding was to-"

"We'll got to Hogwarts." Satsuki told Dumbledore. "On the basis that we are treated as students and not as Harry Potter. This means going to our age group after we use the Sorting Hat and choose our elective classes."

"I...of course." Dumbledore nodded. To him, it would have been easier to place them in the same classes, but perhaps hiding that they were previously Harry Potter would prevent Voldemort from seeking them out.

Satsuki, Uzu and Houta found an empty room, and the two boys pulled out their wands. Uzu scanned the room for charms and Uzu locked the door after stomping on what looked like an ear. "Surprisingly, nothing's listening."

"Still, I don't see the point of going to school when we just have to squish the snake." Uzu muttered.

"You do not see the situation here." Satsuki informed them. "You two only saw an enemy that must be destroyed. All I see is a byproduct of a society that basks in bigotry and hypocrisy. For Voldemort to be truly dead, we do not hunt down the things that keep him alive, but the ideals that turned him into an excuse for these Death Eater's behavior. And to do that, we take over the one position that Dumbledore will not give up."

And they understood her plans.

((Background: There are stories where Harry Potter is summoned from another world. With predictable results, those Harry Potters are not what Dumbledore wants. Obviously, these would be three stories at least.

-Uzu was summoned in Book 4. He kendo'd a dragon and defeated Voldemort, bringing back both Pettigrew and Voldemort. Too bad Voldemort was brought to Azkaban...
-Houta was summoned after 7th year. Dumbledore wanted to keep Houta hidden, though Houta had access to the internet and hacked some databases. Good for bombing Voldemort...
-Satsuki, Uzu and Houta summoned in Book 5, different world...))