He had seen enough movies, anime, and played enough games to know that, at the moment, he wasn't his former self, nor was he Leon Nunez. He was a completely different person altogether.
He was both of them and neither at the same time. It was just how things were, so if asked, he sort of expected the memory loss—hence the book beside him.
They didn't record personal events or anything of that sort. Rather, he wrote down every profitable idea he could think of, from rewriting stories he once read in his past life to business plans aimed at taking advantage of trends in the future—though those depended on a lot of circumstances.
Picking up the book, Leon flipped it open and immediately faced one of the major ideas within the book, though he had no memories of what this story was about.
A franchise called Warhammer 40,000, owned by Games Workshop. Flipping continuously, there were other things to recreate, like Dune, Mass Effect, Halo, Lord of the Rings, etc.
"At least I can comfortably say that my past self was a gamer," Leon muttered, noticing the pattern.
About 90% of every idea here came from a game, meaning that he would need to recreate the game or something. But then, to create a game, you need to have a lore, and his past self wasn't exactly good at that, though he still left enough information for him to work with.
At the very end of the book was something called a Quantum Computer, and it had all about qubits and all… Unlike every other idea here, this was incredibly detailed, meaning that this was fascinating enough for his past self to learn, just as it fascinated him now.
However, he had spent months trying to find if the original owners of these franchises existed and had found nothing. The qubit system, as a concept, didn't even exist, but no matter how he thought of it, it should, since it represented technology never seen and a level of computing power that would blow anyone's socks off.
"The painting does confirm that such a concept can work in this universe, but did no one really think about it?" Leon thought for a while.
It was weird that with how much more advanced this world was, even the concept of quantum computers didn't exist—even as a theory… That area was just blank.
However, after giving it a bit more thought, he simply shrugged it off, since that meant there was more for him to introduce to this world.
Though that was the problem… He had no idea how to bring these into this world. From Warhammer to Attack on Titan, all these were stories that needed exploring.
He had the characters, the world-building, and events that he remembered as of when he wrote this, but now he had no memories pertaining to all these.
"Is it really copying if I have to brainstorm plot lines and all… or would my work just be fanfictions?" Leon thought.
After everything, he simply closed the book and began to practice for the tattoo. He had made up his mind, and if it worked as he believed it would, then he would practically bring nothing back to this place.
The day passed with Leon practicing his skill over and over again, as the art of tattooing oneself was very tricky. Besides, he also needed to finalize a design before he could begin to draw on his skin.
The next day, Leon was sitting in his art room with all his equipment ready to start. He poured his ink and ensured that everything was sterilized before he started.
"God, please," Leon prayed before he placed his hand and prepared himself.
First, tattooing itself was a complex affair that demanded extreme caution. After all, any wrong move would introduce ink into the person's body, which never turns out well.
Second, tattoos were also painful to apply. Yes, the pain was clearly manageable, but it was still painful, which meant that there was a lot of shaking.
Thirdly, he was applying this tattoo on himself, and he wasn't using any regular ink to do so. Leon didn't want people to go around asking questions as to why a 17-year-old boy would have a tattoo, nor did he want anyone who figured out his powers to know what type of tattoos he had.
Hence, he was using invisible ink, meaning even as he applied the tattoo, he wouldn't be able to see it either. To make sure he made no mistakes, the blue lamp before him was needed.
After ensuring that all preparations were set, Leon immediately began. It was painful, but he couldn't shake, or else he would go deeper than expected.
Several minutes to almost an hour later, Leon found himself staring at a glowing tattoo on his arm. It was small and in a location that would be covered up by his shirt, even if he were wearing short sleeves.
As soon as he raised his tattoo pen, Leon felt a wave of mental exhaustion before suddenly collapsing onto the floor. Thankfully, he had prepared for such a scene and had placed several pillows around the chair he was on.