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I Accidentally Built a Harem of Girls Who All Hate Each Other

RSisekai
7
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The average realized release rate over the past 30 days is 7 chs / week.
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Synopsis
My name is Kenji Tanaka, and I'm just a regular high school guy. My motto has always been simple: keep your head down, be kind to people, and get through the day without any drama. Somehow, that backfired. Spectacularly. It started with Yumi, my sweet childhood friend who knows me better than anyone. Then came Akari Saito, the flawless and icy Student Council President who never gives anyone the time of day. After her, Rina Watanabe, the rebellious, flirty gyaru who terrifies teachers and mesmerizes her classmates. And finally, Miki Aoyama, the shy, silent bookworm who seems to live in the library. Individually, they're incredible. But there are two major problems. First: They all seem to have developed... feelings for me. Second: They absolutely, positively, one-hundred-percent HATE each other. My school life is no longer my own. It's a warzone of passive-aggressive lunch invitations, weaponized Valentine's chocolate, and study sessions that feel more like hostage negotiations. Every hallway greeting is a strategic maneuver, every compliment is a declaration of war. And the 'accidents'? Don't even get me started. Tripping, falling, getting trapped in cramped closets... Every day is a new minefield of blushing faces and compromising positions that feel less and less accidental. I didn't ask for this. I just wanted a peaceful life. So how did I accidentally build a harem of girls who all hate each other? And more importantly... how the hell am I going to survive it?
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Chapter 1 - The Calm Before the Storm, and the Storm's Impeccably Dressed Harbinger

The second-floor classroom of Takamagahara High was bathed in the lazy, golden light of late morning. Sunlight streamed through the large windows, illuminating swirling dust motes that danced like tiny, forgotten fairies. The air was thick with the low hum of chatter, the rustle of textbook pages, and the distant, rhythmic thud of a basketball on the court outside. It was, for all intents and purposes, a perfectly peaceful scene.

My name is Kenji Tanaka, and at that precise moment, I was a master of my own tranquil universe.

This is the life, I thought, leaning back in my chair with a contented sigh. My gaze drifted from the impossibly green leaves of the camphor tree outside to the organized chaos of my desk. Everything was in its place. My notes were neat, my pencils were sharpened, and my impending doom in the form of a calculus quiz was still a full period away. Pure bliss.

"Hey, Tanaka, got an extra eraser? Mine just rolled into the shadow realm under Saito-san's desk."

I turned to my friend Kenta, a guy whose perpetually panicked expression suggested he was always one minor inconvenience away from a full-blown existential crisis. His eyes were wide as he stared at the dark abyss under the desk of the girl who sat in front of him.

And that girl… was Akari Saito. The Student Council President. The Ice Queen. The walking, talking embodiment of perfection and discipline. Retrieving anything from the "shadow realm" beneath her desk was less a task and more a diplomatic mission fraught with peril. One wrong move and you'd be met with a glare that could freeze nitrogen.

"Sure, man." I smiled, reaching into my pencil case and pulling out a fresh, rectangular eraser. "Don't risk it. I heard she once gave a guy three hours of detention for breathing too loudly during a silent study period."

Kenta paled. "For real?"

"The legend says his very respiration disrupted the 'scholarly atmosphere'," I whispered back dramatically. I was probably exaggerating. Maybe. With Akari Saito, it was hard to tell. I handed him the eraser like it was a holy relic. "Go, and be quiet."

He nodded gratefully, took the offering, and went back to his work with the reverence of a bomb disposal expert.

See? Peaceful. I was just a regular guy, helping a friend, making a joke. My life was a placid lake of comfortable routines and low-stakes interactions. I woke up, walked to school with my childhood friend, Yumi, endured classes, and went home. Simple. Uncomplicated.

It's funny how you never appreciate the silence until someone starts screaming. Metaphorically, of course. For now.

The bell for the end of second period rang, a jarring shriek that shattered my peaceful bubble. The low hum of the classroom erupted into a boisterous roar as everyone stretched, stood up, and began preparing for the brief respite before the next class. For most, that meant a quick trip to the restroom or a chat with friends. For me, it meant one thing: Lunch.

My stomach rumbled in anticipation. I reached into the side pocket of my school bag, my hand searching for the familiar, reassuring weight of the bento box Yumi had handed me this morning. My fingers met only empty fabric.

I froze.

I patted the pocket again. Nothing. I frantically dug inside the main compartment, my hand swimming through a sea of notebooks and textbooks. Still nothing.

A cold, horrifying dread began to creep up my spine, far more terrifying than any calculus quiz.

No. No, no, no. Don't you dare.

I emptied the entire contents of my bag onto my desk with a loud clatter, earning a few curious glances. Textbooks, notebooks, my pencil case, a stray protein bar from last week… but no bento. No beautifully wrapped, two-tiered box filled with the culinary magic that only Yumi Aihara could conjure.

I had left it on the kitchen counter at home.

The world went gray. My vision tunneled. The joyful chatter of my classmates faded into a distant, mocking echo. The dreaded "School Store Bread" flashed in my mind's eye—a sad, cellophane-wrapped brick of carbs that tasted like disappointment and regret.

My fingers, trembling slightly, pulled my phone from my pocket. There was only one person who could save me from this culinary abyss.

Me: SOS. Code Red. I have committed the ultimate sin.

Her reply was almost instantaneous.

Yumi ♡: Don't tell me. The bento?

Me: It's sitting on the counter, isn't it? Mocking me. Judging my incompetence.

Yumi ♡: It's looking very lonely. I made your favorite tamagoyaki, too. Extra fluffy.

A whimper escaped my lips. That was a low blow. Yumi's fluffy, slightly sweet rolled omelets were a gift from the heavens. The thought of them going uneaten was a crime against humanity.

Me: You are a cruel, cruel woman.

Yumi ♡: And you're a forgetful dummy. Stay put. Your knight in shining armor (and a girl's uniform) is on her way.

Relief washed over me so intensely I felt light-headed. Yumi Aihara. My childhood friend. My neighbor. My savior. What would I do without her? We'd known each other since we were five, when my family moved in next door. She was the one who taught me how to ride a bike, who put bandages on my scraped knees, and who, to this day, made sure I didn't starve to death.

Ten minutes later, just as the break was about to end, the classroom door slid open.

And there she was.

Yumi Aihara was like a sunbeam made manifest. She had warm, chestnut-brown hair that she kept tied in a high ponytail, with a few stray strands that framed her face perfectly. Her eyes were a matching shade of brown, big and expressive and currently sparkling with amusement. A light blush dusted her cheeks from her brisk walk over from the adjacent first-year building. She held the blue, cloth-wrapped bento box in her hands like a trophy.

"Special delivery for one Kenji Tanaka," she announced, her voice a cheerful melody that cut through the classroom noise.

Several heads turned. Yumi had that effect on people. She was cute, kind, and exuded an approachable warmth that made her popular with just about everyone. A few of the guys in my class sighed dreamily.

"Yumi! You're a lifesaver!" I exclaimed, standing up as she approached my desk.

"I know," she said, puffing her chest out with mock pride. She placed the bento on my desk with a soft thump. "I had to use my 'Ultimate Pout' on Mr. Henderson to let me leave class early. He's powerless against it."

"A power too dangerous for any one person to wield," I chuckled, starting to untie the cloth.

"Well, I only use it for the most important of causes. Namely, your continued survival." She leaned forward slightly, lowering her voice so only I could hear. Her scent, a mix of cherry blossom soap and something uniquely Yumi, wafted towards me. It was the scent of home. "You owe me for this, you know. I'm thinking you can pay me back by helping me with my history report this weekend."

"It's a date," I said without thinking, my mind already focused on the tamagoyaki within.

Yumi's breath hitched for a split second, and the blush on her cheeks deepened into a lovely shade of rose. "A… a date?"

Before I could clarify that I meant a "study date"—a completely platonic, non-romantic, history-report-writing date—a voice as cold and sharp as breaking ice sliced through our cozy atmosphere.

"Aihara-san."

We both froze. I looked up.

Standing a few feet from my desk was Akari Saito. Her posture was ramrod straight, her uniform immaculate without a single crease. Her long, silky black hair was tucked neatly behind her ears, and her steel-gray eyes were fixed on Yumi. She held a clipboard to her chest like a shield, her knuckles white.

"Saito-senpai," Yumi said, her cheerful demeanor instantly morphing into one of flawless, practiced politeness. Her smile was still there, but it didn't quite reach her eyes anymore.

"First-year students are not permitted in the second-year building during class breaks without a teacher's pass," Akari stated, her voice flat and devoid of emotion. It wasn't an accusation; it was a simple, unassailable statement of fact. "You are disrupting the educational environment."

Yumi's smile tightened a fraction of an inch. "I was just dropping something off for Tanaka-kun. I was about to leave."

"I see," Akari said, her gaze flicking from Yumi to me, then down to the bento on my desk. Her eyes lingered on it for a moment, and for a split second, I saw a flicker of something unreadable in their depths before it was gone, replaced by the same cool indifference. "While your intentions may be… thoughtful… rules are rules. They exist to maintain order."

"Of course, Senpai. I wouldn't want to cause any disorder," Yumi replied, her voice saccharine-sweet, but I knew her well enough to detect the subtle, steely edge underneath. It was the same tone she used when her mother tried to make her wear a frilly dress she hated.

This was… tense. The air between them was thick with an unspoken rivalry I couldn't begin to understand. It was like watching a nature documentary where two predators were sizing each other up, all while pretending to be fluffy bunnies.

As the designated conflict-avoider, my internal alarms were screaming. De-escalate! Abort! Say something!

"It's my fault, Saito-san," I said, standing up a little too quickly. "I forgot my lunch, and Yumi was just helping me out. She was just leaving. No harm done, right?"

I gave her what I hoped was a charming, disarming smile.

Akari's gaze shifted to me. It wasn't as harsh as the one she gave Yumi, but it was analytical, as if she were scanning me for structural weaknesses. "Tanaka-kun. While your loyalty to your friend is noted, it doesn't negate the rule breach."

Just then, Kenta, who had been trying to make himself as small as possible, chose that exact moment to shift in his seat. His elbow knocked a precariously stacked pile of textbooks on the edge of his desk.

The world slowed down.

The top textbook, a hefty tome titled "Advanced Macroeconomics," slid off the pile. It hit my leg as I was standing, not hard enough to hurt, but just enough to throw me completely off balance.

My arms flailed wildly, searching for something, anything, to grab onto. My center of gravity betrayed me, pitching me forward.

Directly towards Yumi.

"Whoa—!" was all I managed to get out.

Yumi's eyes widened in alarm, her hands coming up in a futile attempt to stop my forward momentum.

And then, I fell.

It wasn't a graceful fall. It was a clumsy, chaotic tumble of limbs and panicked apologies that were still stuck in my throat. My hands, searching for purchase, found something.

Two somethings.

They were incredibly soft. And warm. And they yielded under the pressure of my palms with a gentle squish that sent a jolt of pure, unadulterated electricity straight up my arms and into my brain, short-circuiting every thought I had.

A small, shocked gasp escaped Yumi's lips.

My face ended up buried in the space between her shoulder and her neck. The sweet scent of her cherry blossom soap filled my senses, dizzying me. I could feel the frantic, rabbit-fast thumping of her heart against my cheek. I could feel the impossible softness of her chest pressed against my hands. My entire body was on fire with a brand of embarrassment so profound it was almost a religious experience.

The classroom, which had been buzzing with noise a moment before, went utterly, completely silent. You could have heard a pin drop on cotton.

I was frozen, trapped in a mortifying tableau of accidental indecency. My mind was a blue screen of death. All I could think was, Soft. Oh god, so soft. And I am so, so dead.

I squeezed my eyes shut, wishing for the floor to swallow me whole.

"Tanaka-kun."

The voice was not Yumi's choked gasp. It was Akari Saito's. It was no longer cold or flat. It was low. Dangerously low. It was the sound of a glacier calving into a frozen sea—a quiet prelude to immense, destructive power.

Slowly, shakily, I lifted my head. My hands were still… there. I didn't dare move them. Yumi's face was a stunning shade of crimson, her eyes wide with a mixture of shock and something else I couldn't identify.

But it was Akari's expression that made my blood run cold.

Her mask of perfect composure had cracked. Her lips were pressed into a thin, white line. Her hands were clenched so tightly around her clipboard that the plastic was groaning in protest. And her steel-gray eyes, now fixed on my hands which were still resting on Yumi's chest, were burning with a glacial fire that promised swift and terrible retribution.

The classroom door slid open again with a lazy, almost insolent rattle.

A new voice, tinged with a playful, mocking drawl, drifted into the charged silence.

"My, my. What do we have here? Getting handsy before third period, Tanaka? And in front of the Prez, no less."

I turned my head towards the door. Leaning against the frame, one hip cocked out with practiced nonchalance, was Rina Watanabe. Her uniform skirt was hitched up a few daring inches above regulation, her top buttons were undone to reveal a hint of a black tank top, and her light brown, almost blonde, hair was styled in a trendy, messy bob. A smirk played on her glossed lips as her sharp, intelligent eyes took in the entire, disastrous scene in a single glance.

She pushed herself off the doorframe and took a slow step into the room, her gaze locking with Akari's. The smirk on her face widened into a grin full of sharp, pointy teeth.

"Don't tell me you're going to give him detention for this, Prez. A little physical contact is good for school morale, wouldn't you say?"

Akari's fiery glare shifted from me to Rina, the temperature in the room dropping another ten degrees.

Trapped between a mortified childhood friend, a furious student council president, and a rebellious gyaru who lived for chaos, with my hands in the most compromising position imaginable, I had a single, crystal-clear thought.

My peaceful life was officially over.