In a Honkai reactor laboratory at Schicksal headquarters, Himeko Murata faced an unprecedented predicament, with two S-rank Valkyries blocking her path. Just as she was in despair, Himeko's intense desire to save her students resonated with an unknown entity. 【Hello? Are you in trouble? Do you need a hero to save you?】 "What...is this?" 【If needed, please place an order with Dimensional Odd Jobs Shop. Our shopkeeper can do anything!】 "Please help save Kiana! Please! I'm willing to pay any price!!" 【Request received】【Request details: Save Kiana】【Reward: Everything Himeko Murata】【Awaiting shopkeeper's acceptance, please wait a moment】... Soon after, a beam of light pierced through between Himeko and Rita, and a man wielding a holy sword appeared before her. "So, are you my client?" (The main world of the anime crossover includes classic slice-of-life anime such as Saekano, Oregairu, Eromanga ga Sushi, and Oreimo; the supernatural forces include Touhou Project, Strike the Blood, Nurarihyon no Mago, and High School DxD; the side worlds are tentatively set to Honkai Impact 3rd and One-Punch Man, and will be added later.)

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.

Hello, my name is Cao Shurui, and I am a summoner. A... summoner who can use hero abilities. This book is actually a typical system-based leveling-up story, not exactly a wish-fulfillment novel, but it's fairly standard. Already appeared in: Lord of Magic Bullets and War Maidens, Black Bullet, Chivalry of a Failed Knight, Is It Wrong to Try to Pick Up Girls in a Dungeon?, Campione (before anime time), Blade Dance of the Elemental Master, Campione (anime time), DXD (Part 1), FGO North American Singularity, Strike the Blood, Overlord, DXD (Part 2) + Ending.