A Thousand Years and Still No Conquest of Humanity: What a Loser of a Boss [Crossover]

[This novel will enter the paid chapter tier on October 28, with a 10,000-word update dropping that day. Please show it lots of support~] After running away from home to rebel against the Zoldyck family's Spartan upbringing, Aria encounters all kinds of incredible demons. Hey, you demons can only come out at night, but at least you have all sorts of supernatural powers. How have you still not conquered humanity after a thousand years? The demons next door have humans penned up like livestock and kept as emergency rations! And you Demon Slayer Corps members need to take a good look at yourselves, too! Ignoring someone to protect them, shutting yourselves away because you think you're not good enough, losing your memories after a devastating blow: those tropes stopped being popular 800 years ago! The true path to victory nowadays is brothers fighting side by side to take down the villain. That's how the whole cast survives! Sigh, these people are so hard to manage. Lei, couldn't you build a UV spotlight, or work with Norman to come up with a way to take out that trash boss whose IQ is lower than Connie's, all in one day? Reader's Guide: 1. The Upper Moons are eliminated, but the Hashira survive. 2. Muichiro pairing. 3. Daily updates, with bonus chapters at irregular intervals. 4. Additional setting details can be found in the author's note at the end of Chapter 1. In the Taisho era, man-eating demons run rampant. There are only two ways to kill them: behead them with a Nichirin Blade or expose them to sunlight. But among the Hashira fighting on the front lines, there is one who never carries a blade, yet makes everyone keep their distance. "Why bother cutting off their heads? Just ask them to go sunbathe~" (The opening is a slow burn. Please give this ridiculous story a chance and stick with it until Volume Two, Chapter 17.) [This novel will enter the paid chapter tier on December 31, with a 10,000-word update dropping that day. Please show it lots of support~] ***New story*** "I've Read the Manga, So I'll Tear Up the Script" Dark Era Dazai had everything arranged. He had even decided which corner of a building to jump from tomorrow, when a woman suddenly appeared, knew about the Book, ruined his script, and enthusiastically recommended the "Save Each Other's Beloved" plan. After wavering many times, 270 finally made up his mind to bring his ten-years-younger self over to save the world. But after the plan worked and he awoke from the device, he discovered that his girlfriend, who had nearly been engaged to him, had set his coffin on fire and run off? Hidden away in Beika Town, Zhenlin saw the black-clad man and felt no fear. You're the only organization whose truth I haven't learned from the manga yet, but I've already torn up the scripts of two superpowered Mafia bosses. Should I be afraid of someone who can't even fly? Reader's Guide: 1. Written entirely in third person. 2. Dazai or 270 pairing. 3. The author has a mountain of original settings. Please don't apply quantum mechanics to a fictional world. 4. A lighthearted, snarky story. Take it seriously and you lose. Theme: Sunlight is good for your physical and mental health.