My Clingy Yandere Stepsister Turned Out to Be My Ex’s Twin Sister [Dropped] - Chapter 01: Dumped by My Girlfriend, Saved a Yandere Stepsister

Volume 01

Chapter 01: Dumped by My Girlfriend, Saved a Yandere Stepsister

This is the R18 version of a story I originally wrote on another site.

Hope you enjoy it!

“I’m sorry, Ryota-kun. Let’s break up.”

It happened one evening, near the end of summer vacation.

As the sun set behind the amusement park entrance, my girlfriend spoke those crushing words.

“H-Huh…? M-Mishiro…? What did you just say…?”

Standing before me was Mishiro Azusagawa, a girl with long, silky black hair and pure white skin.

A second-year in high school. Seventeen years old.

Her big, dark pearl-like eyes and delicate, doll-like features made her breathtakingly beautiful.

On top of that, she was both athletic and academically gifted—the very definition of perfection.

At school, everyone called her an angel.

Her looks, her personality… everything about her fit the name.

And somehow… I, Ryota Iida, had been lucky enough to be this angel’s boyfriend.

She was my first-ever girlfriend.

I spent all of my first year working up the courage, and this spring, I finally won her heart.

But now…

“Ryota Iida-kun. Let’s end things between us.”

…She was breaking up with me.

“Huh? Wait, wh-why? Mishiro… why? What did I do?!”

My voice came out louder than I intended.

“Hie…!”

Mishiro flinched and backed away from me, her entire body trembling in fear.

“Ah, um… sorry.”

“No… I’m sorry. When a guy raises his voice, it scares me.”

Mishiro hugged herself as she spoke.

Hearing my own girlfriend say she was scared of me… it honestly hurt.

“At least tell me why… tell me what I did wrong, Mishiro. We were doing fine, weren’t we?”

I had been in the same class as Mishiro since our first year of high school.

We were both chosen as class representatives.

Spending time together, working on class duties, we naturally grew closer… until one day, I confessed. She said yes.

“I still like you, Ryota-kun. Even now.”
“T-Then why…?”

I stepped closer.

Mishiro immediately took a step back.

…It felt like she was rejecting me.

But I didn’t want her to run away. I wanted her to at least hear me out.

“Why are you saying we should break up? Tell me.”

I grabbed her shoulders.

“…!”

“What do you hate about me? If there’s something I need to fix, I will. If I did something wrong, I’ll apologize. So please… don’t just throw everything away like this—”

“Noooooooooooooo!”

A sharp slap struck my cheek.

…Huh?

What just happened?

What… was that…?

“Don’t come any closer!”

“Huh…?”

It took me a moment to process what had just happened.

Mishiro was looking at me with teary eyes, my left cheek was stinging…

…Did she just slap me?

“I-I’m sorry, Ryota-kun… I’m so sorry… but… I just can’t do this.”

“C-Can’t…? What do you mean?”

“I can’t handle being around men.”

For a second, I had no idea what she was talking about.

She can’t handle men?

“I… I have a problem with being touched by people. Especially men… If they touch me, I break out in hives.”

Mishiro pulled her sleeve down, exposing the bare skin on her shoulder where I had grabbed her earlier.

There were actual red bumps forming on her skin.

“Y-You’re serious…?”

“Yes…”

Thinking back… Mishiro always wore white gloves at school.

Everyone just assumed it was part of her style.

But… was it actually to avoid touching people?

“B-But why? If you really couldn’t stand men… why did you date me?”

If she had such an extreme reaction to guys, it didn’t make sense why she even agreed to be my girlfriend in the first place.

“Because… you were different from other boys, Ryota-kun. You were kind, considerate… and most importantly, you never looked at me the way other guys did.”

Mishiro had a stunning figure.

Countless guys were after her, and most of them couldn’t help but stare at her body.

To the boys in our class, she wasn’t just an angel—she was a goddess.

“I… I can’t handle being touched by anyone except my dad. Even when I went to the doctor, they couldn’t figure out why. So I just kept it a secret all this time.”

“I see… so that’s how it was.”

A heavy silence fell between us.

Mishiro had a severe case of germophobia—so extreme that she couldn’t even touch men.

[TLN: Shouldn’t this be androphobia?]

For a couple, that was… too much to handle.

No kisses. No hugs. Nothing beyond that either.

“I’m sorry. I can’t give you anything. I’m a failure as a girlfriend. I feel so guilty for putting you through this… that’s why…”

Tears streamed down Mishiro’s face.

So this was why she wanted to break up.

I mean, I got it—being in a relationship but never being able to share any intimacy would be tough. And for her, it must’ve felt like she wasn’t fulfilling her role as a girlfriend.

But… even so.

I still loved her.

Even if I could never touch her.

“I-It’s fine! Don’t worry about it! I’ll endure it—I don’t care if I can’t kiss you, hug you, or even hold your hand! I’ll hold back on everything, so… so please!”

“I’m sorry.”

Once again, Mishiro pushed me away.

“Why?! I swear, I won’t do anything you don’t like!”

“I can’t…”

“What is it about me?!”

“Because in the end… you’re just like every other guy.”

…Her words hit me like a bucket of ice water.

“…Ryota-kun, you were the most gentlemanly guy in our class. You never looked at me with those eyes, never tried to touch me casually. I thought… you were different. I had hopes.”

…Had? Why was she talking in past tense?

“But then… the moment you became my boyfriend, you started wanting so much from me.”

“I mean, of course I did…!”

This was the first time I was hearing about her condition.

Isn’t it normal for a guy to want to be close to his girlfriend?

To want to kiss her, hug her, hold her hand…?

“And the final straw was today. In the Ferris wheel… you pushed me down.”

“!? That was an accident!”

We had gone on the Ferris wheel just before this.

A strong gust of wind rocked the gondola, and I lost my balance—ending up hovering over Mishiro.

Now that I thought about it… she shoved me away back then, too.

“…I thought you were different. I’m disappointed.”

“No, you’ve got it wrong! It really was an accident! I never had any intention of forcing myself on you!”

“…But eventually, you would have wanted to, right?”

“W-Well…”

Of course I would have.

That was just natural. I was a guy, and she was my first girlfriend.

I had desires too. I wanted to kiss her, hold her, and yeah… go further than that.

Wasn’t that obvious?

“You say you’ll hold back, Ryota-kun… but what guarantee do I have? There isn’t one, is there? That’s why… I’m sorry.”

With those final words, Mishiro turned on her heel.

“Goodbye.”

She ran off without looking back.

And I… couldn’t bring myself to chase after her.

“…What the hell is that supposed to mean?”

I had never been rejected so completely in my life.

I even told her I was willing to accept everything, that I would endure it all.

But even that was tossed aside.

“Ugh… ngh… uuuuugh…”

The girl I loved had turned her back on me.

She dumped me without even giving me a chance.

And all I could do… was cry.

★

“I feel like shit… I just wanna die…”

On my way home from the amusement park, I wandered aimlessly through the night.

This had to be the worst day of my life.

I wish I could just disappear…

And then—

“Stop it! Let me go!”

A girl’s voice rang out from a deserted alleyway.

I instinctively turned my head in the direction of the noise.

And what I saw was…

“M-Mishiro…?”

There she was—my ex, the same girl who had just rejected me.

A group of men had her cornered.

Probably a bunch of guys trying to hit on her.

…But something felt off.

Her hair color seemed different.

Even her outfit wasn’t quite the same…

“Help! Somebody!”

She screamed.

I stopped in my tracks, hesitating.

Should I help the girl who just dumped me?

The answer was obvious.

“OFFICERRRRRRRR! OVER HERE! THERE’S A GIRL BEING ATTACKED BY A BUNCH OF THUGS!”

I shouted at the top of my lungs—pretending like I had actually brought the police with me.

I made sure to sell it, acting like the cops were right behind me.

“Shit!”

“Damn it!”

“We gotta run!”

The guys scattered like cockroaches.

All that was left was the girl.

“Hey, are you okay, Mishiro?”

“…Mishiro?”

As I approached her, I realized something.

“Wait… no. You look like her, but… you’re not Mishiro.”

Her hair was soft and light brown, cut to a medium length.

She wore a mini-skirt, a slightly loose top, and some accessories—things Mishiro would never wear.

But her face… 

She looked exactly like her. It was almost eerie.

“Um… thank you for saving me.”

She lowered her head in gratitude.

“I’m Yuzuki. Yuzuki Iida.”

This was the girl who would soon end up living under the same roof as me…

The girl who would steal every one of my firsts.

The stepsister I never saw coming.

This was my first encounter with Yuzuki.