[Transmigration + Another World + No System + Fantasy + Magic + Slice of Life]

"Brother, we're going to be late! Please get up quickly!"

"Sleep a little longer, sweetie, let me sleep a little longer..."

"Big brother, wake up! Today is the entrance exam, if you don't get up I'm going to use the special wake-up service!"

"Um... Xiaoxue, could you please get off me first?"

Grandmaster Dongfang Bai's greatest achievement upon traversing the Celestial Empire—

Not becoming a Level 0 loser,

Instead, she became the "key protected waste" of the genius mage's sister.

Younger sister: A level 5 genius beauty whose daily skills are being able to defeat everything in sight and creating "surprises" for her brother.

Brother: Lv0 Salted Fish, his survival skill is to try not to be driven away by his sister's excessive protectiveness.

On the first day of school, the entire school witnessed this outrageous scene:

"My sister could punch Cerberus to death, but she insisted that I braid her hair myself."

"My brother can't even make a water balloon, but he's the best brother in the world! ...Hey? Brother, don't run away!"

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.