Two years ago, on the Isla Kentorum, Emilia the Hero and her comrades were storming the Devil's Castle.
It was a day she would never forget.
The unbelievable power radiating through the grand corridors of the dimly lit fortress pressed itself against Emi like invisible pillows, and she found that even with her incredible Celestial Force, it still managed to make breathing difficult. She paused for a second, panting in her heavy armor as Olba, Emerada, and Alberto came to a halt behind her, breathing just as hard as she was.
"I never would've guessed Satan to possess this much power," Olba wheezed.
"Perhaps he's… summoned his Generals together… for one final showdown," Emerada posed, her lack of breath causing her to shorten her syllables.
"Just a little farther, everyone," Emili growled.
The humans of Ente Isla were counting on the Hero, and she'd driven hard against the Demon King and his Queen, pushing their forces back, inch by bloody inch, until finally his armies had been consolidated at the castle they stood in now.
Once more, the group took to sprinting, their breaths quick and shallow as they tried to work past the discomfort. They arrived in a large hall of sorts, the kind which might've been used to host a royal gala. It was large, empty, and just as dark as the rest of the castle, but at the far end rose two large thrones, carved into the dark stone walls. In these thrones sat two people: the Demon King, and the Demon Queen. The Devil, Satan Jacob, sat in his throne, gripping at the arms of the stone chair with black talons as his red eyes carefully picked out the Hero and her allies.
At the Demon King's side was his Queen, whose eyes shown with a violet malice. She had talons longer than her King's, and long violet hair, which hung in elegant locks about her head, held in place by a golden circlet. The Devil was dressed in dark robes, with a long, billowing cape, sewn with large leather pauldrons.
The Demon Queen wore a fine dress, and a similar mantle to Satan's though hers looked more ceremonial, and less rugged.
"Demon King, Demon Queen, I am the Hero of Ente Isla," Emilia cried from across the hall, cutting through the oppressive layer of demon magic with her holy sword, "in the name of the Church, I hereby slay the both of you for the good of humanity!"
"I'm afraid that I cannot allow that," echoed a voice, the ever faithful Demon General Alciel stepping in from the shadows, his ambers eyes glowing golden as he glared at the war party, "and unfortunately for you, our victory was assured as soon as you stepped foot into this room!"
Alciel clicked his fingers, the sound echoing off of the dark stone walls as the grand doors closed shut behind Emilia, Olba, Emerada and Alberto, cutting off any chance of escape.
Battle commenced quickly enough, as all sides were impatient for the final confrontation. Emilia charged straight for the Demon King, Better Half flashing brightly as she cut through beams of demon magic, gaining ground fairly quickly. Emerada and Alberto took on Alciel, two in one, and managed to incapacitate him long enough to aid the Hero, who charged in and slashed a horn from Satan's head.
The Devil roared at the Hero, and from behind her, a clawed hand raised to strike, rose the Demon Queen, Helena, fierce and terrible as she made to slash through the Hero's armor.
Olba threw a bolt of Holy magic at the queen's back, smiting her. It burned a hole through the Demon Queen's mantle, and turned her attention from the Hero, thus saving Emilia's life.
Emerada and Alberto rejoined the battle as well, quickly gaining the upper hand as they all battered against the solitary Demon King. Alciel returned shortly thereafter, angry that the humans had bested him for even a moment. The Demon General bore witness as the Demon Queen quickly took control of the battle between herself and Olba, but things with the Devil were not so good.
"Alciel," Helena roared, "take Satan and leave! I will hold off these whelps!"
"I cannot leave you, your highness," Alciel called out, making haste to her side so as to help her overwhelm the High Priest.
"Do as I command," Helena roared, using her magic to push Alciel away, "a Kingdom is lost without its King!"
Alciel was torn, and after a moment he let loose a roar that made everyone turn to look at him. With a golden gleam in his eyes, he threw enough power at the humans surrounding the Demon King to blast open the wall behind them, and with the Demon King in tow, Alciel took to the skies.
"Turn around, Alciel, I am your King! We cannot abandon Helena," the Devil shouted.
"A Kingdom without a King is lost," Alciel shouted over the wind in his ears.
"HELENAAA," the Devil shouted, holding out a hand as he watched the Demon Queen battle, four on one, against the humans.
Satan's final thought was one of anger as the Demon General opened a gate, and cast his King into it before following after his liege.
The Demon Queen smiled, knowing that the Devil was safe as soon as the Gate closed. She fought with renewed vigor, a savage grin upon her face as she threw every ounce of demonic magic she had at her adversaries. She sensed something off, though, and after a moment, she realized that the Hero had withdrawn, and was rocketing after Satan and Alciel.
"No!"
It was far too late, for even as the gate waned and finally snapped shut, the Hero shot through it like an arrow through a bullseye. The Demon Queen, distraught and angry, levelled a hand at Emerada, Alberto and Olba, freezing all three of them in place before the Demon Queen threw open a Gate herself and flew inside. As soon as the Gate closed, the freezing spell lifted, leaving Emerada, Alberto, and Olba with a battle to attend to, and unsure as to whether or not the Hero was alright.
Two years passed in Tokyo, Japan, and for a time there was peace for the Devil and his Demon General as they adjusted to the strange ways of plant Earth. Then, along came the Hero, adding chaos to the mix as she did her utmost to kill and contain the Demon King and his plans to subjugate both Ente Isla and Earth. The day finally came when Sadao Maou saved Emi Yusa from a somewhat creepy Archangel, earning her trust as they learned to live side by side.
"Here ya go," Emi said, extending a hand, and giving Maou a spare umbrella.
It was raining out, just as it had been when Maou had first met the Hero. With a sigh of relief, Maou opened the umbrella, glad that he was no longer getting soaked.
"Thanks," he muttered.
"You're welcome," Emi said, twirling her umbrella happily.
It was a warm, humid day up until that point, but a crack of thunder made Maou jump as he felt an intense chill grip the air around him. His breath began to fog, and the rain picked up as the clouds grew thicker, and the day grew darker.
"This wasn't in the forecast," Emi said quietly, peering up at the sky from beneath her umbrella.
"Nor was this," a woman's voice hissed from behind her, "die, Hero!"
Emi spun around, only to be assaulted by-
"Huh," Emi wondered aloud, looking down at the young girl on the sidewalk behind her, who looked furious as she beat Emi fruitlessly with a wet umbrella of her own.
"Wha-hey, cut that out, you'll get me all wet," Emi said, looking around for the parent of the deranged child, who's expression soured when she realized the Hero was not affected by her attack.
"Emi? Who are you- HELENA?!"
"S-Satan Jacob," asked the young girl, looking at Maou with wide eyes as she accidently dropped her umbrella on the sidewalk.
"You know this little girl Maou," Emi asked, raising an eyebrow at the Devil, who looked as though he might run away screaming, or start crying at any moment.
"This is-" Maou began.
"I am Helena Jacob, Demon Queen, and commander of Satan's Legions!"
That was one of few days Maou called in sick to work, and Kisaki, who sat at her desk, listening to the stress in his voice, decided to allow it. As she hung up her phone and sighed, making the appropriate changes to the roster in her head, she couldn't help but wonder what could've happened to make her most dependent and loyal worker go AWOL.
"Ok, so let me get this straight," Emi growled, her eyes flickering between Maou, his two Demon Generals, and the Demon Queen, who scowled right back at the Hero.
They were sitting in Maou's apartment, and Emi, Maou, and Helena were all soaking wet, and cold. Ashiya, ever the worrywart, brewed a fresh pot of tea and put the steaming hot mugs into the hands of the Demon King and Queen with reverence. He thrust a cup into Emi's hands as well, though it was much less caring.
"You… the little girl who looks like she should be on her way to primary school… are the Demon Queen, Helena?"
"Foolish human," Helena scoffed, "I am actually in middle school!"
Emi's eye twitched, and Maou slapped a hand to his forehead. Ashiya shook his head, and Urushihara actually looked up from his laptop to smirk for a second before ignoring the new guest of the house once more.
"Helena," Maou asked suddenly, "what are you doing here? The last I saw you were-"
"Fighting to save you," Helena said, pointing accusatorily at Maou, "I told you, didn't I? I said 'If we attack Ente Isla now, we'll be vulnerable! I told you that it was a risky decision! We could've waited another hundred years, but noooo! Stupid little Satan had to go and ruin everything!"
"You can't talk to me like that just because you're older than me," Maou said angrily, "and besides, in this world, I'm the older sibling!"
"Come again," Emi asked, one eyebrow raised as her whole head cocked to the side, unsure as to whether or not she'd heard that right.
"What's with all this shouting," Suzuno said suddenly, kicking in the door to the Demon Fortress and looking grumpy, "I was trying to sleep!"
"It's four thirty in the afternoon," Ashiya said, "that day is almost over and you're still sleeping?!"
But Emi was still enraptured in the bickering between Maou and the middle schooler, who claimed to be his older sister… and was treating him much like you'd expect.
"Idiot little brother!"
"Stupid sister," Maou retaliated.
"Ok, Suzuno had a point, you guys should quiet down," Urushihara said, massaging his temples as he felt a headache start to throb in his skull.
"Loser," Helena said loudly.
"Brainiac," Maou replied in kind.
"GUYS!"
Emi's shout cut through the din of everyone talking at once. She felt many angry eyes upon her, but ignoring this, she said, "If you guys are brother and sister… how the hell are you two married?!"
"We're not, Emi," Maou said, waving his hand at the Hero, "don't be stupid."
"Demons are not so petty as humans," Helena smirked, "we do not need marriage to consolidate power. So long as you have sufficient will, anyone can rule with anyone. It's purely political, and based on the results you bring to the table."
"So… you're not a couple?"
"Ugh, you humans have the sickest mindsets," Helena grumbled, holding a hand to her mouth and looking ill.
"No, Emi, we're siblings, that's it," Maou said, looking at the Hero with disdain, "get your mind out of the gutter!"
"Wait a moment," Suzuno said, her eyes flickering between Maou and Helena, "you two are related?"
"This is the Demon Queen," Maou said wearily, gesturing at his sister, who looked at him rather angrily at this lackluster introduction.
"Idiot!"
"OW!"
Helena took off her book bag, which, as it just so happened, was filled with several heavy books, and she walloped her brother over the head with it. She then re-shouldered the bag in a single movement, and stepped forward to shake Suzuno's hand.
"Demon Queen Helena," she said in a rather business-like fashion, "and you are?"
Suzuno took the little girl's hand, and before anyone could catch her, Suzuno's eyes rolled into the back of her head and she swooned, falling to the floor with a thud.
"That was rude," the Demon Queen noted, withdrawing her hand and taking a seat next to her brother once more.
"So, do they just call you Demon Queen Helena, or is there another name we can call you to avoid suspicion," Ashiya asked, whisking away Helena's empty teacup and refilling it.
"Chimei Akuma is my human name," Helena said, "though you may call me Helena if you wish. It makes no difference."
"Wait, chimei means deadly… and akuma means demon… you literally named yourself 'deadly demon,'" Maou asked, laughing at his sister as she pouted, looking embarrassed.
"I was trying to explain who I was to the fools at the Ministry of Justice when applying for citizenship," Chimei sighed, "and through my Idea Link, they mistook the words I used to when referring to myself as my actual name."
"That doesn't explain why you're so young though," Emi noted, "when I fought you…"
Emi could barely remember all the details, but she knew for a fact that when she'd fought the Demon Queen, she was a fully grown demoness, and had stool taller than Emi herself.
"Huh? Oh, I suppose I am looking quite young, aren't I," Chimei said, scrunching her eyebrows as she poured a little magic into her appearance and slowly but surely aged. Soon enough, she looked about as old as the Hero, with long indigo hair and….
"Dammit," Emi growled, staring at the Demon Queen's chest with envy, as her aging spell had amplified her assets considerably.
"There! Now I can ditch that horrible orphanage," Chimei said, tossing her long hair over her shoulder and picking up her teacup. Maou, however, continued staring at his sister, open mouthed. Chimei took notice, and she glowered at him.
"Take a picture, it'll last longer," she said darkly.
"How come I can't do that!? What sort of spell did you use?! Teach it to me!"
"No way, you'd end up doing something stupid, besides, you've been around looking like that for some time, you can't just go changing your appearance when you have to go to work tomorrow," Chimei said wisely, looking happy at the fact that she had one-upped her brother.
"I hate you," Maou said, crossing his arms and glaring at his sister, who smiled widely at him.
"Love you too, little bro!"
"So then… it wasn't a dream," Suzuno asked, sitting up with Emi's help as her eyes focused upon the Demon Queen once more.
"Nope. Sorry if I scared you," Chimei said, flashing a friendly grin at Suzuno, who looked as though she might faint once more, "I'm Chimei! An enemy of my idiot brother's is a friend of mine! Aside from the Hero, that is. And the Church… and Heaven."
The Demon Queen shot a look of seething dislike at Emi before smiling at Suzuno once more. The clergywoman blanched.
"S-she changed form," Suzuno said, "I think I preferred the little girl….Blergh."
And so Suzuno once more faded from consciousness.
"Are you doing that on purpose," Emi asked exasperatedly, tapping Suzuno's face as she tried to wake her.
"Doing what? Being nice and introducing myself? I'm not using magic, if that's what you're implying," Chimei said hotly, looking angry for a moment before turning to Maou.
"Anyway, I hope you have money for another sleeping bag and more pillows, cause I'll be staying with you from now on!"
Chimei's words seemed to break through Suzuno's subconscious, because she groaned in her sleep as Emi tried to shake her awake.
"Just end me now," she moaned, "I can't deal with another Devil at my doorstep. God, forgive me, I've failed as your Inquisitor!"
Maou, on the other hand, was suddenly alight with righteous fury.
"Wha-you mean-NO! Absolutely not! I don't care how bad that orphanage was, I can't support four people by myself, all the while putting up with Heroes and Clergywomen, and whatever the hell else Heaven decides to throw at me!"
"Not a problem, I can get a job with you," Chimei said, picking at her toes as she ignored her brother's outrage.
"I don't care if you're my twin sister, no means no, dammit! Out! Out with all of you! I've had it with these people in my Castle! Demon Generals, to me, we're clearing house!"
Just like that, Lucifer and Ashiya were on their feet, tossing both Emi and Suzuno out on their butts. Suzuno, however, was still unconscious from shock, but from within the sounds of Maou's apartment came the roar of a dragon and the shrill cries of Maou and his subordinates as the Demon Queen unleashed her wrath upon them. There were crashes and bangs, and still more cries before the dust finally settled, and Emi dared to peek inside the room.
Ashiya had Chimei by the arm, and was doing his utmost to pull her towards the door while Urushihara and Maou pushed upon her. The Demon Queen, however, looked unbothered, her arms crossed and her stance relaxed as all three demons failed to make her budge.
"Get… out," Maou growled through gritted teeth.
"Make me," Chimei yawned, raising an eyebrow as the Demon King and two of his Generals did their utmost to remove her from the premises.
"Don't make me use my magic," Maou warned his sister.
"Try it, see what happens."
Maou's eyebrow twitched, and finally he fell back, his eyes glowing with a fierce crimson light as he leveled his hands at his sister and intoned a spell of force. A wave of power flashed from the Demon King and smote Ashiya, Chimei, and Urushihara, however, Maou cringed as both of his Demon Generals were thrown out into the hall, past Emi, and into the wall opposite, leaving the Demon Queen to turn and glare at Maou in an annoyed fashion.
"Ugh, you're so stupid," she scoffed, walking by Maou, and kicking him in the shin before laying out a sleeping bag and curling up in it, ignoring Maou's pained groans as he lay on the floor as well, clutching his leg.
"Now what're you doing," Maou muttered, noting how his sister had stolen his sleeping bag: the bulkiest and most comfortable of them all.
"I'm going to bed,"Chimei said tiredly, "and tomorrow, I'll be coming with you to apply for a job at MgRonalds. Don't embarrass me, idiot."
"Ingrate," Maou seethed, still rubbing his shin as Urushihara and Ashiya hobbled back inside, nursing injuries of their own.
"What am I supposed to do with her," Emi asked indignantly, jabbing a thumb over her shoulder at Suzuno, who was still snoozing peacefully out on the floor of the main entryway.
"Put her back in her room and go home," Maou grunted, getting up to shut the door.
Emi put her foot in the way, forcing Maou to face her for a moment.
"This isn't over," Emi said, looking deadly serious.
"Not even close," Maou sighed, "in fact, I'd say things are just getting started."
With that, Maou closed the door in Emi's face, leaving her to lay Suzuno back down in her apartment and catch the train home, thinking hard on the Devil's words, and the troubling appearance of the Demon Queen.
Hey all! So this fic was a prompt from my friend and editor, misssexysmartypants, who challenged me to write a humorous story about the Demon King's sibling sister, whereas she would write about the Demon King's sibling brother. I gave the prompt a lot of thought, and after some time I had a character figured out. Sort of. As you can tell, she is the epitome of the anime big sister. She calls the Demon King an idiot (frequently) and she vehemently believes he is at fault for their loss during the final battle, the detail for which I had to change around to fist this alternate version of history.
What does the emergence of the Devil's big sister mean for the fate of our little family?
Your guess is as good as mine, but I assume we'll see in the upcoming chapters!