Hakuto jolts awake—Cold sweat clings to his skin.
Just a nightmare… probably from all the chaos in his new life.
Pale moonlight seeps through the blinds, casting soft stripes across his new bedroom—it's way bigger than his old one. There's a wide wardrobe, a desk, and a double bed. Why a double bed?
«That way, when you feel like sleeping with your little sisters, all three of us can fit just fine. Rika and I thought it was super sweet! Don't you agree?»
That was Yuzu's explanation… though Hakuto highly doubts Rika had any say in the matter.
The clock reads 4:00 AM.
Too early to start getting ready for his first day at the elite Tsugumi High School—too late to fall back asleep.
Still groggy, Hakuto stumbles out of bed and drags himself down the long hallway lined with doors, straight toward the living room.
«Aaaah… oh, yeah… aaaaah…»
The silence of night is broken by soft, overlapping moans—clearly coming from the master bedroom. Unmistakably his dad and Kagura.
«They're still at it…?» Hakuto mutters, face flushing crimson.
But just before stepping into the kitchen, something catches his eye.
In the corner of the living room, under the window, someone's curled up cross-legged in a velvet armchair.
One hand holds a thick book with a violet cover and black metal patterns.
The other, a half-empty glass of red liquid—wine, probably.
Moonlight glows faintly on her skin.
It's Yuzu.
She's wearing nothing but a tight white tank top—her nipples clearly poking through—and a pair of soft white lace panties.
But this isn't the usual bubbly Yuzu from earlier.
Her expression is calm. Serious. Focused.
For just a moment, Hakuto swears her eyes glow faintly red as she sips her drink.
Must be the light. A reflection. Or he's still half-asleep.
«Isn't it kinda early to be hitting the booze…?» Hakuto mumbles, rubbing his eyes.
«Maybe. But aren't you up pretty early yourself?»
Yuzu sets the glass down on the table and closes the book gently.
Her voice is calm. Not slurred. Not teasing.
Nothing like the Yuzu he saw giggling after one sip just yesterday.
«Had a nightmare. Got up for some water, that's all.»
«I see… looks like our parents are having a bit too much fun tonight—that's why I couldn't sleep. So here I am.»
Then she stretches slightly. «But we should probably get back to bed. Big first day tomorrow at Tsugumi High School. Teachers there don't go easy, even on newbies. You don't wanna show up half-dead, right?»
«Yeah… I guess you're right. Though I doubt I'll get back to sleep now.»
Yuzu stands and walks to the sink. She dumps the wine and rinses the glass.
~Probably doesn't want Kagura finding out her fifteen-year-old daughter was drinking at 4 AM…~
«If you can't fall asleep, just say so. You can use my boobs as a pillow while I rub your back. You'll knock out in minutes. That's what little sisters are for, right? To help big brothers relax.»
~The usual Yuzu is back...~
♡♡♡
«Please welcome Hakuto Tendo, of the Narkhalis family. Starting today, he'll be your new classmate.»
Hakuto stands stiffly at the front of the classroom, trying not to squirm under the weight of dozens of icy stares.
It's like the whole class is thinking: Who's this guy? Some random the prestigious Narkhalis family picked up off the street?
Or at least… that's what it feels like.
That's his intro to Class 2-B of the Tsugumi High School.
The math teacher, Misaki Yuunami—a striking woman in her forties with an athletic figure, hazel eyes, and her hair pulled up in a sleek bun—gestures for him to sit down.
To his surprise, Hakuto discovered only this morning that Rika is in the same class. Yuzu, meanwhile, got sorted into Class 1-A.
«Alright then. Let's resume the lesson. Who can solve this logarithmic equation?»
Behind her, the blackboard is covered in numbers and symbols that look like some lost alien language to Hakuto.
Not really a flaw of the school… more a consequence of his old one—an actual den of delinquents on the edge of Tokyo.
After Shin lost his real job, it was the best he could afford.
A moment after that question, Rika—seated at the first desk in front of the teacher's podium—springs to her feet.
The girls' uniform at Tsugumi is elegant: a crisp white shirt under a black sleeveless jacket trimmed with silver, black tights ending mid-thigh, and a skirt that stops just above them.
The boys wear a sleek black suit with silver lines in the same style.
«Excellent work, Miss Narkhalis. Brilliant as always.»
The teacher praises her—a compliment accompanied by the composed applause of the rest of the class—after Rika solves that complex mathematical problem in an instant.
«Your stepsister truly has rare and unique intelligence. It's no coincidence she's the student council president, and also the most admired student in the entire institute. I even heard she gets daily offers from prestigious high schools around the world to finish her studies with them. Living with a globally recognized genius must be quite the fortune, right?»
The voice comes from the seat next to Hakuto.
He turns—and sees a guy with bright carrot-orange hair grinning at him.
«Yeah… I guess it is kind of a fortune...»
Hakuto is caught completely off guard by those revelations—after all, he and Rika hadn't even exchanged a single word the day before, let alone talked about their private lives. Then again, Yuzu had warned him about her older sister's reserved and introverted nature.
«Anyway, I'm Itsu Thazreel. Nice to meet ya.»
«Mr. Thazreel! Mr. Tendo's been here for two minutes and you're already corrupting him?! One slacker in this class is more than enough!»
«I'm sorry, Professor Yuunami! I'll be quiet as a mouse! Promise!»
Itsu jumps to his feet and bows dramatically, earning a wave of glares from the entire class.
Especially Rika's.
Yep—definitely not the most popular guy here.
♡♡♡
A single note is left on the large glass table in the living room:
[We've left for our honeymoon and we'll be away for a few days. Be good and don't slack off with your studies. If you need anything, don't hesitate to call. Smack! 💋]
Hakuto, Yuzu, and Rika all stare at the note in silence.
«Guess the honeymoon is on Mom's credit card…» Rika mutters, clearly annoyed.
Yuzu, on the other hand, starts bouncing around the living room.
«We've got the whole house to ourselves for days?! This is gonna be the best week of my life!» then she eyes Hakuto. «So… how good are you at cooking?»
«Why would that matter?» Hakuto asks.
«Seriously?! You don't expect me and Rika to do all the cooking, do you?!»
«Last I checked, I'm the guy and you two are the girls. Obviously, housework's your job.»
«For once, I agree with Yuzu!» Rika snaps.
«There's no way we're your maids this days. We're splitting chores. And since you're not touching my underwear or setting foot in my room—the kitchen's all yours.»
Her tone is cold. Final. Dead serious.
Hakuto's shoulders drop. «But I… I only know how to make instant yakisoba…»
Rika shakes her head in disappointment.
«I'd never marry a guy who can't cook. Even if he were the last man on earth.»
«Big sis, are you saying the way to your frozen heart is with a hot bowl of ramen?» Yuzu smirks and elbows Hakuto. «You heard her! Time to learn, if you ever wanna get into Rika's panties!»
«I-I NEVER SAID THAT!!!» Rika explodes, red as a tomato. «It was a general comment!!»
Yuzu's already off in her own world.
«Come on, Hakuto! I'll teach you how to make restaurant-level ramen! Leave it to your adorable little sister! Wait here—I've got the perfect outfit!»
She bolts down the hall, and Rika sighs.
«I've got studying to do. Call me when dinner's ready—I'll be in my room. And don't come in without knocking!»
Ten minutes later...
«Sorry to keep you waiting! I found the perfect outfit for your first cooking lesson!»
Yuzu returns—She wears a white kitchen apron.
That wouldn't be a problem… except she's wearing literallynothing underneath.
Most of her huge boobs spill from the sides of the thin fabric, and the apron only barely covers the essentials below. The back? Completely open.
«W-What kind of outfit is that?!»
«To make sure you stay focused on the lesson and don't get distracted unnecessarily!»
~Stay focused? This is gonna have the exact opposite effect…~
«Anyway! Now we're making omurice—with ketchup and mayo on top! So simple even a three-year-old could cook it!»
Yuzu starts whipping up fresh mayo while Hakuto's job is chopping onions. They work side by side at the counter.
Surprisingly, things go better than expected.
At first.
«Come on, Hakuto! At this rate, we'll be eating omurice for breakfast!»
«I-It's not my fault…!»
Tears stream down Hakuto's face. He's never cried this much in sixteen years.
Yuzu sighs. «Let me show you how to slice onions properly.»
—BOING! Yuzu presses her chest against Hakuto's back, wrapping her hand over his to guide the knife.
The apron is thin. She's not wearing a bra.
He can feel everything.
«Y-Yuzu… what are you doing?!»
«Teaching you to cook, duh. What else?»
She's so casual that Hakuto actually starts to feel guilty.
~Wait… is she actually serious this time? So why am I the one thinking dirty stuff?!~
«Big bro, you're hopeless in the kitchen…» Yuzu sighs. «I'll handle the onions. You whisk the mayo and check the noodles. And don't overcook them! I don't like soft things in my mouth—I prefer them hard.»
«Why do you have to make everything sound so wrong…?!»
«Who said I was talking about cooking?»
«Yuzu…!!»
Hakuto furiously stirs the mayo in a large bowl, eyes burning.
~Damn onions… I can't see a thing!~
«B-Big bro… what did you do…?»
Yuzu's voice comes out as a soft, teasing moan.
With a reckless flick, Hakuto flings a blob of mayo straight onto her boobs and face. The thick white mess drips between her breasts and under the apron.
«S-Sorry, Yuzu! I didn't mean to! Let me clean it!!»
He grabs a damp cloth and, still half-blind, starts rubbing vigorously.
«Oh, Hakuto… so forward. If you keep rubbing like that, I might—aaah…»
«Forward? What—?!»
Only then does Hakuto realize he's been massagingher boobs like crazy.
Blinded by onion tears, he didn't notice how intimate the whole scene looked—until it was too late.
As he stumbles toward the sink, Yuzu casually fixes the apron, covering herself again.
«All done! Despite all that… the omurice turned out awesome!» she beams. «Bring some water to the table and call Rika. I'll plate everything.»
Hakuto nods… but freezes when he opens the fridge.
The bottle of red wine that was nearly full last night… is now way lower.
~Did she drink more after I went back to bed? There's no other way. She was with me all day. I need to talk to Rika about this. Yuzu's weird, yeah—but she's still my little sister. If something's wrong, I gotta look out for her~
Still thinking, Hakuto heads for Rika's room. He's about to open the door—
Then stops.
~Right. Knock first.~
He taps the door with his knuckles...but it was only half-closed. The moment he touches it, it swings open.
Rika is lying on her stomach, reading a violet book with black metallic trim— the same strange book Yuzu was reading the night before.
But that's not what grabs his attention.
She's in pink lingerie, and the way she's sprawled across the bed makes her round, firm butt fully visible.
«H-Hakuto…» she hisses through clenched teeth, not even looking up. «I-I'll kill you.»