The battle against Voldemort had been raging for the better part of six years, ever since that fateful day in the department of mysteries. Fortunately on that day none of the Order members were lost, unfortunately since then there have been casualties suffered on both sides.
Every year Harry Potter got stronger, learned more, made more allies. And yet every year he is evaded by Tom. No matter what he learns, Tom already knows it, no matter what the battle, Tom has already experienced it, and no matter how many allies, Tom's are always fiercer and more blood thirsty. Or at least that's what every one tells Harry.
Even though Harry trained with many of the best in practically every field, no one thought he was ready.
He had met many strong people through the years, many of them capable of defeating Voldemort on their own, and yet they all didn't even attempt it because HE was the chosen one. Sure they were willing to help and support him, but none of them offered to stand in front with him and face the dark lord. Time after time it was drilled into Harry's head that he had to be the one to defeat Tom. And so when finally some one did offer to take on his role he hesitated, positive that they would fail, and he would have the guilt of sending them to their deaths.
These people were powerful and great, with vast amounts of battle experience, and years of practice. They were on a level of their own, higher even than that of Merlin himself. Living in an alternate world, parallel to that of Harry's, they were know as the saviors of their planet and were called Gundam Pilots.
It was with complete accident that they crossed paths with Harry. He had been tossed into their world by a wayward spell and literally landed on them. After a few misguided threats, gunshots, and a few well placed knives, they quickly became best friends. Harry ended up staying with them for three months before finding a way to return home.
The pilots had offered to help any way they could, including just killing Voldemort themselves, but Harry refused. They made him promise to call them if in need of their services, and set up a spell with him that would pull them instantly to his world if he spoke a specified phrase.