Traveling through One Piece, Zack became the "consumable" with the highest mortality rate in the CP9 training camp. There is no system gift, only two hidden talents: [General Knowledge of All Worlds] and [Domain Constitution]. He is as patient as a wolf, well versed in the ways of the world, and can play with the power field of the secret service agency in his hands. Everything is just for one goal - to get the underestimated Door Door Fruit. When the fruit awakens, the "door" is no longer a simple space channel, but is upgraded to a conceptual power: the enemy's attack can be decomposed by the infinite door, and his fist can travel through space and hit the vital point. And this is just the beginning. The pirate world is just his first stop to accumulate original capital. When "

Academy City. A magical city with a population of 2.3 million, filled with countless individuals possessing extraordinary abilities. Standing at the pinnacle of that city are true monsters. The first, Accelerator. The pinnacle of existence, possessing the strongest and most evil ability to truly control the direction of all energy, the strongest and most all-powerful monster in Academy City. He will face encounters with countless worlds that transcend time and dimensions. This is a world where countless imaginative beings converge, a world of magic, a world of technology, and all sorts of people and things will mingle within it. And then, the first will experience all of this firsthand. "—Interesting, then let me see how your so-called justice actually works, heroes?" Accelerator, who has degraded himself to a villain, the most vicious and evil anti-hero, what kind of encounters will he encounter on this journey beyond dimensions? The strongest and most evil one-way dark hero awakens here. A crossover anime/manga fanfiction, the protagonist is Accelerator from the original work, striving to recreate the feel of the original A Certain Magical Index.