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.

I'm in the Honkai world, having just traveled through time. The question is, what's with this strange narration? [Take off! Take off! Such a wonderful start! Looking at this opening, you feel like your life is about to reach its peak.] No, it doesn't feel like it's taking off at all. Besides, the Honkai world is notoriously unfriendly to ordinary people, right? (╯‵□′)╯︵┻━┻. [There are many beautiful Valkyries to choose from.] [Even if you want to go big, there are Honkai Gods, Soulsteel Mini-Bishops, and Cyborgs as well.] [You feel like you're already fired up!] Not at all... Wait, Otto, you can do that? [Changkong City! The place where destiny begins! This is the perfect place for you to take your first step after traveling through time!] [Defeat the Herrscher of Thunder, then collect the Herrscher of Void and the future Herrscher of Reason into your crystal palace—the world is mine!] Wow, with this setup, you want me to go head-to-head with the Herrscher? I get it. You probably want me dead.

After traveling through time and space to become the 28th daughter of Big Mom, Li Yisi thought her life would end with a minor role except for her pretty face that didn't match the style.

Unexpectedly, she was lucky enough to awaken the Type-Moon system. As long as she had the Saint Crystal, she could summon the Heroic Warriors whose style didn't belong to this world!

When Li Yisi thought of the strength of the Heroic Spirit, she seemed to see the title of invincible waving to herself.

However, in order to get the Saint Crystal, she must first complete the tasks assigned by the system. As a lolita who is not yet an adult in the literal sense, Big Mom does not allow her to leave the Kingdom.

...

In the quiet morning, Li Yisi stared at Katakuri who ate the donuts that she and Medea devotedly dedicated, with sharp eyes.

Another day of trying to run away from home.

Lan Tangying, who travels through the world of anime, obtains the Heart of the World and, starting from that world, creates his own. Step by step, he expands the world and replenishes himself until he becomes the master of the infinite multiverse. Experience the daily life of anime in the main world, and travel through the worlds of Demon Slayer, Inuyasha, Genshin Impact, and more.

Nangong Xiao: "I know more about this other world than anyone else." Asuna: "..." Nangong Xiao: "I'm not cheating, really, why are you looking at me like that?" Kasumi Utako: "..." Nangong Xiao: "Who says a cruel other world can't have a normal daily life?" Maple's eyes lit up: "!!" Nangong Xiao: "War is always the last resort. If you play it like a normal card, things will get very..." Shizuka: "Shut up! You're the main DPS, just focus on outputting damage!!" Nangong Xiao: "Ah, oh, coming right now..."

Also known as: "I am possessed by Ying Jie and my personality is split every day"

Mu Bei traveled to the continent of Teyvat with the Yingjie possession system.

The first thing I saw was the pink fairy lady who was as gorgeous as flying flowers.

"You have to believe that a cute girl's heart can do anything♪"

So there was a pink fairy grocery store in Mondstadt, which didn’t sell groceries but was only there to help people solve problems.

"The owner of that shop is so nice, and he always likes to put musical notations at the end of his letters. I'm going there again next time!"

"What? You're asking about Noelle? She's working as a clerk in that store."

Later, cats in Mondstadt began to disappear mysteriously frequently, and the Fatui envoys from the Goethe Hotel frequently reported thefts, which gave the Knights of Favonius a headache. This was until Diona, the bartender at the Cat's Tail Tavern, broke down and came to Jean, shouting that there was a thief who attacked her late at night and she was not after money, but only wanted to pet the cats!

Everyone knows that the new female archer adventurer who came to Mondstadt and never misses her target can learn music from Venti like an artist, and talk about alchemy with Albedo like a senior scholar. She even has a seizure occasionally, rushing into the Hilichurl camp roaring and howling, leaving wailing everywhere she goes.

Her best friend, Bennett, scratched his head at this.

"Why does Mu Bei always like to beat up the hill people while yelling for Brother Jie to stop?"

(Originally also known as Honkai Impact 3rd: My Perfect Life Simulation System)

Alicia: "Oh, Xiaochen, you are so cute. This pink skirt must suit you very well! Oh, don't run~"

Mei Lei: "Su Chen, I am willing to fall into darkness in exchange for you returning to the light, just like you once saved me."

Xilin: "Brother, you said you would stay with me forever. This time I won't let you leave my side again."

Lin Zhaoyu: "Big Brother, do you remember that you still owe me a promise? I am willing to spend my life with you."

The Herrster of Knowledge: "Traitor, come and take my sword!"

That day, Kiana was dozing off in St. Freya's class, Luminous had just arrived in Mondstadt, and Star, March 7th, and Danheng were still cleaning up the antimatter legion at the Black Tower space station. They were all about to embark on their own destinies, but that day, a screen suddenly appeared, instantly changing their fates. Along with the various fan-made videos playing on the screen, even the characters themselves were "given away."

I've traveled to the world of Uma Musume and gained access to a 2D armor system. Yay!! Let's do something, let's do something! Do you like this Uma Musume armor with 2D templates? ... Amusement Park Knight (Platinum): "I don't feel like working hard today. Want to go out for a stroll in the city with me?" World Devourer (Mobius): "Little white mouse, where do you want to go? Let's play some games~" Qiqi's Favorite (Ganyu): "Want to work overtime with me, Miss Luna?" So! Say! Isn't this a good idea? Right?

[Also known as: Starry Sky Railway: I Became the Cocoon of the End]

Lu Xing, who stayed up late and worked hard on the Star Dome Railway, suddenly died. When he opened his eyes again, he found himself traveling to a dangerous game world.

He wanted to survive slowly but ended up in the cocoon of death.

Therefore——I am the collapse!

[Some settings are original or modified, just treat it as a parallel world]