Heroic spirits, celebrated for their achievements, become heroes. Accidentally traveling through time and space, they gain access to the Heroic Spirit Achievement System, where their deeds are solidified into attributes, abilities, and skills... Slay demons and gain demonic special attacks. Slay dragons and gain dragon-slaying treasures. Steal a nation and gain weapons to plunder. Slay gods, slay demons, and confront three thousand worlds... The starting world is Demon Slayer. Expected storyline: Slash Akame no Yaiba, a comprehensive world of Warring States-era monsters (Inuyasha, Nura, Sekiro, Oda Nobuna, and more). P.S.: This is not a nerd's guide, as it contains alternate settings, so please don't read too closely... Thank you for your support! Even if you haven't read the original work, you can still read it as original...

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.

What bad luck! I choked to death after drinking a sip of warm water and traveled to this upside-down world!

What is upside down? It means that in a world where women are the mainstream, the attributes of men and women are reversed!

He thought he would live an ordinary life, but on the day of his high school graduation, a thing called the Sprite took him to a dimensional chat world that connected the heavens, changing his original life trajectory.

Yan Shuangying: How can someone like you change...

Xiao Yan: Thirty years on the east side of the river, thirty years on the west side of the river...

Spider-girl Shiraori: I...I...

Komon Ikki: Light is a bond...

Aqua: Hahahaha…

Kato Megumi: Oh my, I didn't expect that my presence is still so low here, I am inaction...

Ye Wuwei: ...The introduction is weak, please read the main text!

Time travel happens every year, and this year it's my turn.

There are infinite worlds, and there are infinite me!

Link in the world of Jackie Chan Adventures: "Since the black and positive energies can balance the combat power, when the black energy camp is dead, I can occupy all the black energy, right?"

Link in the world of One Piece: "As a marine, it's so easy to get promoted. I can make achievements along the way with Luffy. When I catch Kaido, I will be promoted directly to admiral!"

Link in the world of Hunter x Hunter: "A bunch of stinky brothers, do you understand the value of Angewomon as a mind beast!"

In Naruto, in One Punch Man, in Marvel, in Dragon Ball...

I just want to rely on myself to become the strongest in the world!

Good news: I've traveled through time, to the world of Fairy Tail. Even better news: The magic can summon plants, and not just any plants, but the ones from the Plants vs. Zombies mini-game. Bad news: I haven't seen Fairy Tail, so I don't know the plot. Even worse news: The summoned plants aren't the ones Kern is familiar with. ...Kern, having traveled through time, gazed upon the summoned [Worker Sunflower], [HR Ice Shooter], [Surplus Value Sun Mushroom], and all sorts of other bizarre plants, lost in thought.

The world of mutual understanding is the most ridiculous.

The peace of infinite dreams is the most hypocritical.

Darkness, cold-bloodedness and cruelty are the truest portrayal of this world!

So, you wanna dance too!?

Ye Xuan transmigrated to a fantasy world and became a Quasi-Immortal Emperor in just a million years, hailed as the Number One Emperor of All Heavens. Just when Ye Xuan thought he would continue to break through, becoming an Immortal Emperor, and even transcending the heavens, a multiverse video website appeared, pulling him in. The opening scene was a review of figures from all heavens, showcasing the glorious achievements and highlight performances of the listed powerhouses. One after another, these peerless powerhouses shook countless strong individuals across all heavens and myriad realms, and the number one spot belonged to him—the ultimate battle at the end of the Boundary Sea. He fought three emperors alone, and the fall of an emperor brought sorrow to all heavens. Witnessing that ultimate battle at the end of the Boundary Sea, countless strong individuals across all heavens and myriad realms were utterly shocked…

In the era of Lox, a time of warring states and legendary tales, a 15-year-old boy named Pegasus, harboring unknown ambitions and wielding a blade called Wind Chaser, embarked on a turbulent journey.

His starting point was the Rocks Pirates, the most feared and infamous pirate crew on the vast ocean.

The protagonist travels to Uncle Nine's world and joins a chat group. It's just that the members are all little brats: the beast-milk-loving Emperor Desolate, Kanna, the dragon maid from the Krillin family! Magical Girl Sakura, Nezha the Magic Pill, Tushan Susu, Haibara Ai (??? Is this considered a cub???), Xiaoyu from Jackie Chan's Adventures, and Son Goku from Dragon Ball...

In this parallel world of the blue planet, the world has been invaded by an existence called Samsara Paradise since no one knows when. In the paradise, opportunities and risks coexist, and death and rebirth dance together. Whether it is wealth, beauty or the powerful force to destroy the world, players can get... Dongfang Shangcan: Wait, beauty? When he became one of the top players in the paradise, he had a painting hung in his castle, which depicted the lively scene of him having a party with dozens of women. Kanroji Mitsuri: Huh, everyone is so cute, I like it! Kirishima Touka: It turns out that from the perspective of an observer, it is actually unsightly? ! Ye Ye: Shangcan is a playboy. Rem: He is worthy of being the master (World: Academy Island, Resident Evil, Demon Slayer: Kimetsu no Yaiba, Tokyo Ghoul, Mecha, Goblin Slayer, Re:Zero, Gantz...) PS: It is mainly the infinite flow of various anime.