Yuuji Sakai, the usually vacant and somewhat weak protagonist, lives an ordinary life until the sudden appearance of a monster disrupts his ordinary life. Under the setting sun, Yuuji is suddenly attacked by an alien monster that transforms human "existence" into spiritual fire and then devours it.

At this time, a girl who called herself "Flame-haired and Burning-eyed Slayer" appeared and rescued Yuuji from the monster's mouth. Yuuji Sakai named her Shana based on the name of her large sword.

She told Yuji that his life was about to end - it turned out that outside this world, there was another world called the "Red World". In order to realize their ambitions, the people there took away the world's original power, the "power of existence", from humans one after another, and Yuji was one of the victims.

After the Crimson Apostle took away the "Power of Existence",...

[Bungo Stray Dogs fanfiction + short story + romance + OOC warning + immature writing style, free-flowing, slice-of-life plot, the protagonist will not be part of the original story, it's a fanfiction with many original characters, please don't read if you mind, and you can get the general style from the synopsis] Self-introduction: I am an assassin. After all, in a dangerous world overflowing with superpowers and guns, isn't it normal to be an assassin? By the way, my performance is 100%, and I still have the professional ethics of an assassin. I can't call myself the number one assassin, but I can barely be the number two? After all, my main job can't support my living expenses, so I can only occasionally do side jobs to maintain my precarious life. Serious synopsis: Me (without blushing or skipping a beat): "I'm a law-abiding citizen." "..." Would a normal person introduce themselves like that? After several years of assassin experience, I unexpectedly joined the Armed Detective Agency after a day trip to the military and police, becoming a member. It feels good, except my wallet hurts. Everyone: "Isn't this your own fault?" I can't refute it: I'm overwhelmed with sadness. Later, the conspiracy known as "The Book" fell on my head. I'm so annoyed: I've already told you I have nothing to do with the book, but you just won't believe me. Thumbs up, six. And then… I can't spoil any more!!! Attention!!! This isn't a fictional story; the main character is female. CP: Hmm, forget it, I'm too incompetent to write romance. (Originally it was Dazai.) Let's go with a friendship story. Also, proceed with caution before jumping in.