[Crossover] After Becoming the Demon King

#I still want to check the original for accuracy, so I guess I'll hold off on starting this for now. Sob. The drafts I wrote without checking the source are such garbage qwq Six years after his parents sold him to a great demon to be his granddaughter, Suzuki Iruma not only graduated from demon school, but even became the new Demon King of the Netherworld. However, when the Demon King, now a young woman, accepted the grimoire and scepter supposedly left behind by the previous Demon King at her coronation, she vanished from the throne. "???" "Oh no! His Majesty Iruma has disappeared!!!" "L-Lord Sullivan!? Oh no! Lord Sullivan has fainted!!!" Having vanished as suddenly as the previous Demon King, Suzuki Iruma stood blankly between two rows of demons in black suits, while those who had witnessed the new king's coronation fell into chaos. She was still holding the scepter and grimoire. "Um..." "The 'book' is in her hands! Charge, brothers!" "...Huh? Huh? Huh!?" The Demon King, who had no idea what was going on, was completely flustered. Can someone explain to me what on earth is happening!? The pairing is still Dazai! Don't ask why. The answer is that I love him! (Since a fellow fan had the main idea of her upcoming story stolen, and the plagiarist had the gall to play innocent, I'm recording my story ideas starting today. I can't remember exactly when I came up with them, so let's use today as the starting date. Written on 2020/05/18) Theme: A mischievous, spoiled brat and a passive skill that makes it impossible to refuse