The Testament of Sister New Devil: Daily Life Contract
By [Author Name]
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*"If you want to protect them, then protect them. If you don't want to, you can refuse. But those girls have nowhere to go."*
Toujou Basara has been alone for a year now. His mother is dead, his father is always overseas on photography assignments, and the fifteen-year-old has learned to fill the silence of an empty house with the rhythm of his own cooking. He's left his violent past behind—or so he tells himself. The mark beneath his eye and the strange pattern on his wr
The Testament of Sister New Devil: Daily Life Contract - Stepsister, Raid. ~The Day the Contract Was Reversed~
"...You're my—"
The wind swept through the residential street at dusk.
The black-haired girl standing at the front door was looking straight up at Basara. Her long black hair swayed in the breeze, casting shadows across her pale skin. Her violet eyes glinted in the setting sun.
(...What's with this girl?)
Basara forgot to speak.
Behind her was another one. A girl about middle-school age with pink twintails poked her head out, her big pink eyes fixed intently on Basara.
"So you're Toujou Basara."
The black-haired girl spoke in a low voice.
"...Yeah, that's me."
"Hmm."
She looked him over from head to toe—an appraising, testing sort of gaze.
"Fine, whatever. I'm going to cast a master-servant contract spell on you now. So be a good boy and become my servant."
"...Huh?"
Servant. Did she just say servant?
"Wait, hold on. What the hell is a master-servant contract?"
"Shut up! Just let me inside already!"
"But—"
"I said let me in!"
Mio stepped forward, right into his space. She was small, but somehow overwhelming.
"Big sister, you're way too impatient~"
The girl behind her giggled.
"Maria, you keep quiet!"
"Okaaay."
The girl called Maria bounced up beside Mio.
"Big brother, nice to meet you. I'm Naruse Maria. Nice to meetcha."
She gave a little bow. Her smile looked oddly mature for her age.
"O-Oh. Nice to meet you too."
"Big brother, you smell so good...♡"
Maria suddenly flung herself against Basara's chest.
"Whoa, wait—!"
"Sniff sniff... ahh, there it is. The scent of a young man's vitality. Looks delicious..."
"Vitality!?"
Maria's small hands wrapped around his waist. Her soft body pressed flush against him.
"Big brother, you're so warm...♡"
"Maria! What do you think you're doing!?"
Mio grabbed Maria by the scruff of her neck and peeled her off.
"But big sister, you're gonna put a contract on big brother, right? I figured I'd charge up on vitality first."
"Like hell you will! You perverted succubus!"
"Succubus..."
Basara braced a hand against the doorframe. His head was spinning.
(A succubus—the kind that feeds on men's vitality...)
"How long are you going to stand there? Get inside."
Mio marched into the entryway, kicking off her shoes carelessly and heading down the hall.
"H-Hey! Don't just walk in!"
"It's your house, isn't it? You're the one who told me to come in."
"I didn't say that!"
"Big brother, just give up. Once big sister makes up her mind, she never backs down."
Maria smiled cheerfully as she took off her shoes.
"...Man, whatever."
Basara heaved a deep sigh.
—And so began his first meeting with the two who would become his stepsisters.
■
Once he showed them into the living room, Mio planted herself dead center on the sofa. Arms crossed, legs crossed—every inch the queen.
"So. When do we start?"
"...Start what?"
"The master-servant contract spell, obviously! How many times do I have to say it!?"
Her eyes flared bright violet.
"Your eyes—"
"How much do you actually know? Has Jin told you nothing?"
"All my dad said was that I'd be getting stepsisters."
"What? That old man didn't explain a single thing that matters!"
Mio raked her black hair back in frustration.
"Fine. I'll explain, so listen carefully."
She straightened her spine.
"I'm Naruse Mio. Daughter of the previous Demon Lord. Your father—Jin—introduced me, and that's why I'm here. And I'm going to form a master-servant contract with you. Once the contract is in place, it'll stabilize my magic power. That's the situation."
"The Demon Lord's... daughter..."
Basara thought back to his father's words the night before.
—One of them carries the blood of the previous Demon Lord.
(So it was true.)
"The master-servant contract spell is a pact formed between a demon and a human. Originally, it's magic for a demon like me to subjugate a human like you. To activate it, we need to recite an incantation using each other's blood and name."
"Blood..."
"That's right. So I'm going to take a little of your blood now. Hold still."
Mio pulled a small knife from her skirt pocket.
"Hey, wait a second! Blood, out of nowhere!?"
"It won't hurt! I'm just nicking your fingertip!"
"That's not the issue!"
"Big brother, it's fine. Big sister's magic is the real deal. She practiced the contract incantation and everything."
Maria chimed in cheerfully from across the table.
"Maria, don't say unnecessary things!"
Mio's cheeks went faintly red.
"...You practiced?"
"S-Shut up! Just give me your hand!"
Mio grabbed his left hand.
"...Nn."
Slender fingers. But her grip was strong.
She pressed the knife to the tip of his index finger. A tiny prick of pain. A bead of red blood welled up.
"My name is Naruse Mio. By my blood and my name, I make this man my servant—"
Mio began the incantation, low and clear.
The air in the living room pulled taut.
"—The power dwelling in that blood, the soul carved into that name, bow before me—"
Her violet eyes blazed.
"—Gather. Submit. As my servant, for all eternity—"
And then it happened.
Mio's voice stopped dead.
"...Huh?"
She stared at her own hand.
"W-What... is this..."
Violet light was spilling from her palm. Thread-thin, it writhed and crawled up her arm.
"No—that's wrong! I was supposed to make you my servant—"
"Mio! Let go!"
By the time Basara shouted, it was already too late.
The violet light leapt from Mio's hand to his like a spark.
—Crack.
"Gh!?"
His left wrist burned.
When he looked, an intricate pattern had surfaced on his wrist—a band of markings circling it like a bracelet.
"W-What the hell is this..."
"...No way."
Mio clutched at her own throat.
A red pattern had appeared on the pale column of her neck—small, shaped like a chain.
"No, no, this can't be... I was supposed to be the master, not the servant...!"
"Servant...?"
Basara looked from his left wrist to Mio's neck and back again.
"W-Why!? Why am I the servant!?"
Mio shouted, her face bright red.
"Oh dear~ Big sister, you tripped over your words during the incantation, didn't you? Looks like it failed."
Maria was giggling.
"I did not trip! My tongue just got a little tangled!"
"That's what tripping over your words means, big sister."
"Shut up! I'll kill you a hundred times!"
Mio lunged at Maria.
"Now, now, big sister. Don't get mad. The fact is, the contract got reversed."
Maria nimbly dodged her.
"...Reversed."
Basara still hadn't caught up to the situation.
"Yep. Originally, big sister was supposed to be the master and big brother the servant. But because she messed up the incantation, now big brother's the master and big sister's the servant."
"I keep telling you I didn't mess up!"
"Yes, yes. Anyway, big brother—take a look at your left wrist."
Basara looked.
The pattern was glowing faintly.
"...So this is the proof of the contract."
"That's right. The contract bracelet. Proof that big brother's the master. And the one on big sister's neck is the servant's mark. Big sister can't disobey big brother's orders anymore."
"Can't disobey..."
"Hey! Don't explain things on your own!"
Mio clamped a hand over Maria's mouth.
"Mmph mmph."
"You forget everything that just happened! Got it!?"
Mio pointed at Basara.
"I mean, telling me to forget..."
"I said forget it! I'll kill you a hundred times!"
Her eyes blazed violet.
Just then, the lights in the living room flickered.
"...Mio, calm down. Your magic is leaking."
Basara grabbed her shoulder on instinct.
"Don't touch me!"
She tried to shake his hand off.
—And in that instant.
The strength drained out of her body.
"...Huh?"
Mio slumped onto the sofa.
"W-What... my body... I can't..."
"Ah, figures. When the contract's unstable, her magic won't stabilize. Big sister, your magic's badly out of whack right now. At this rate, you might go out of control again."
Maria's expression turned suddenly serious.
"Out of control... I don't want that..."
The color drained from Mio's face.
"It's okay, big sister. If you deepen the contract, your magic will stabilize."
"...Deepen the contract?"
"Yep. To deepen a master-servant contract, the master and servant have to touch each other. Hugging, kissing—that kind of thing."
"Kissing!?"
His voice cracked.
"W-W-W-What are you saying, Maria!?"
Mio shot to her feet, scarlet.
"I'm saying, to deepen the contract, you need physical contact. Big sister, if you don't cling to big brother, your magic won't stabilize, you know?"
"L-Like I'd cling to this guy! I'll kill you a hundred times!"
"But at this rate your magic's going to go berserk, isn't it? And if that happens, you'll cause trouble for everyone around you, won't you?"
"...Nn."
Mio had no comeback.
"...Hey, Mio. You don't have to force yourself. If the contract's unstable, there might be another way."
Basara peered into her face.
"...Shut up. I don't need your worry."
Mio turned her face away.
But her ears were bright red.
"Big sister, don't be stubborn. It's true that the contract is making your magic unstable. At this rate, it's genuinely dangerous."
Maria took Mio's hand.
"...I know."
Mio murmured.
"...I know. But I still... I don't know anything about you."
She glanced at Basara.
For just a moment, unease flickered in her eyes.
(...She's acting tough, but she's actually scared.)
Basara thought.
She'd come to a strange man's house, failed her contract, ended up the servant. Of course she'd be uneasy.
"...Got it."
Basara sat down facing her.
"W-What?"
"You need to deepen the contract, right? So I just have to hug you, right? Come on, then."
He spread his arms.
"Huh!? W-Why are you so calm about this!?"
"I'm not calm. I'm embarrassed too. But if your magic goes berserk, you're the one in the most danger. And it'd cause trouble for the neighbors too."
"...Nn."
"Big brother, so cool~♡"
"Maria, be quiet!"
Mio fidgeted for a while.
"...F-Fine. It's for the contract. Don't get the wrong idea!"
She threw herself at Basara.
—Thump.
"...Nn."
Soft.
Her body was softer than it looked. And she smelled good—a sweet, floral scent.
"...W-What? Hold still."
Her voice trembled against his ear.
"...You're the one who needs to relax. You're stiff as a board."
"Shut up! This is fine! It's for the contract!"
Mio wrapped her arms tight around his back.
—And in that moment.
The bracelet on Basara's left wrist glowed warm.
The pattern on Mio's neck shone with the same color.
"...Ah."
The tension drained from her body.
"...Calmed down?"
"...Yes. Somehow."
Mio gave a small nod.
But she was still holding on.
"...Hey, how long are you going to cling to me?"
"Y-You're the one who should let go!"
Mio sprang away. Her face was bright red.
"I-It's not like I think anything of you or anything! It's for the contract! The contract!"
"I know."
Basara smiled wryly.
(...Man, what's with her. She's got a cuter side than I expected.)
"Big sister, your face is all red~"
"Shut up! I'll kill you a hundred times!"
Mio hurled a cushion at Maria.
—And so the night at the Toujou house began rolling in a truly outrageous direction.
■
"...So what do we do about dinner? Should I cook?"
Basara stood in the kitchen and opened the fridge.
"You're going to cook?"
Mio called from the sofa, sounding displeased.
"I'm the only one here, aren't I?"
"What kind of tone is that? I can cook too, you know."
Mio stood up, indignant.
"Big sister, maybe don't. Your cooking is..."
Maria tried to stop her, pale-faced.
"Maria, you be quiet. I'm cooking."
Mio marched into the kitchen.
"...Can you actually cook?"
"I can! I've done all sorts of things in the human world, you know."
She pulled eggs and bacon from the fridge.
"...What are you making?"
"Omurice. Just watch."
Mio put a frying pan on the heat.
"Big brother, maybe you should check where the
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