Somehow I Ended up Dating the Perfect Female Classmate, but My Sister Found Out and They're Turning Into Yanderes - Chapter 30-31

Chapter 30: The Incident at the Cram School

“Haa, haa, haa”

As usual, Ayuka pedaled her bike fast.

School was over, and we were heading to the cram school.

But today, there was no class.

Before tests, the cram school held a study session where we handed our phones to the teacher, removed all distractions, and focused on studying.

Well, in my case, I had my imagination as a weapon, so it didn’t help much.

“Bro, does your neck still hurt?”

Ayuka kept looking back, checking on my neck.

Was Ayuka really a tsundere little sister…?

The kind of tsundere sister all guys in the world wished for?

I appreciated her concern, but I’d be happier if she slowed down her pedaling a bit.

We arrived at the cram school and went to park our bikes.

And there, surprisingly—

“Hey, Kiyoto-kun! What a coincidence!”

Kirino-san was parking her bike.

Today, Kirino-san kept worrying about my neck.

This morning, she asked me over and over who did it, so I just said some thug attacked me.

I thought I could tell Kirino-san the truth, but I hesitated to say it was Rinka.

“Um, you’re the youngest sister, Ayuka-chan, right?”

“Huh? What? Can you not call me ‘chan’ so casually?”

As expected, Ayuka didn’t seem to like Kirino-san much.

“Sorry. Was I too familiar? But since you’re my dear Kiyoto-kun’s sister, I thought I’d like to get closer.”

…Was Kirino-san teasing her a bit?

“…Bro, let’s go.”

Ayuka ignored her, grabbed my arm, and pulled me into the building.

“Hey, wait a sec!”

“Tch.”

Kirino-san followed, and Ayuka clicked her tongue lightly, choosing the stairs over the elevator.

Ayuka and Kirino-san climbed the stairs fast.

“Why are you in such a hurry, Ayuka-chan? Even if you get to the cram school early, you can’t study with Kiyoto-kun, right?”

Yeah, Kirino-san was definitely teasing her.

We reached the top of the stairs and entered the cram school.

“Hey, hello. Ayuka-chan, Kiyoto-kun, and Kirino-chan, too. Kiyoto-kun, you’ve got a girl on each arm, huh?”

Headmaster, that kind of comment won’t work with these two…

“Well, Kiyoto-kun, shall we study together? See you later, Ayuka-chan.”

“!”

Kirino-san grabbed my arm and headed to the high school classroom.

Ayuka looked frustrated, lowered her head, and started walking alone toward the middle school classroom.

“Oh, since you three came together, I’ll make an exception and let you all study in the same classroom today.”

“Huh?”

Kirino-san reacted first to the headmaster’s kind suggestion.

Her smiling face turned serious in an instant.

“I mean, why not study together in one room?”

The headmaster seemed a bit scared of Kirino-san’s serious face, which wasn’t usual.

I’d seen this side of Kirino-san before, but I still wasn’t used to it.

“It’s a nice offer, but middle school and high school are totally different, and Ayuka-chan might prefer—”

“Bro, let’s go.”

Ignoring Kirino-san’s attempt to decline, Ayuka headed to the high school classroom.

Well, Ayuka was tall, so blending in with high schoolers wouldn’t be a problem.

…Though that probably wasn’t the issue.

“Hey, Ayuka-chan, why don’t you sit at that corner seat?”

“Bro, I’m sitting here, so you sit next to me.”

Ayuka completely treated Kirino-san like she wasn’t there.

In the end, Ayuka, me, and Kirino-san sat with me in the middle.

Luckily, there were few students studying in this classroom.

But if any Joto Nishi students were here, rumors would definitely spread.

Well, that would just make my meals tastier.

“Hey, Bro, about this problem…”

For some reason, Ayuka kept asking me about problems.

Normally, Ayuka never asked me for help with studies.

Sometimes, I, three years older, got help from her.

Plus, the problems she asked about were so basic that there was no way Ayuka couldn’t solve them.

“Hey, Ayuka-chan. Kiyoto-kun is trying to focus on his test studies, so asking him so many times might be a bit annoying.”

“Huh? Can you shut up? Your talking is more annoying to me.”

Today’s middle school girls are scary…

“Annoying, huh… Oh, I know. I can teach you.”

“Do you not have ears? I just indirectly told you to shut up. Can’t you understand that? And you think you can be Bro’s girlfriend with that brain? That’s a low level.”

Ayuka’s sharp tongue was intense today…

I was almost impressed, but then—

“!?”

What was that? The sound of a pencil breaking!?

No, it was the sound of something sturdier than a pencil breaking.

What was it…?

I looked around to find the source, and my eyes landed on Kirino-san’s right hand.

Wasn’t the pen Kirino-san was holding snapped in two?

The bottom part was on the desk.

“…Oh, s-sorry, Kiyoto-kun. Did I startle you? The pen somehow broke.”

Noticing my gaze, Kirino-san gave an awkward smile and quickly hid the pen.

As I watched, my mind started debating who was stronger, Rinka or Kirino-san.

—

Chapter 31: A Dining Table For Three People

“Hey, big bro and Ayuka-nee, welcome back.”

When Ayuka and I got home, Fuzuha greeted us at the entrance.

“I’m back, Fuzuha. So… dinner?”

“…It’s every person for themselves again today.”

I couldn’t imagine Rinka not preparing dinner two days in a row, but since she was holed up enough to skip school, maybe it made sense.

“I’ll go buy something from the convenience store nearby. Tell me what you want.”

I told Fuzuha I wanted katsu curry and started heading upstairs.

“Wait.”

Ayuka grabbed my hand.

Her grip was surprisingly strong, and it hurt.

“I said this morning, you don’t need to check on that woman.”

She was calling Rinka “that woman” now…

“But we can’t just leave her like this forever, right? We’ve got tests this week.”

“Even if we leave her, it’ll just affect her grades or promotion, not you.”

“Yeah, but letting her stay shut in like this…”

“Then kick her out.”

“…”

That was just plain scary…

Ayuka was completely furious at Rinka.

The cause was definitely what happened two days ago.

At first, I was happy Ayuka was angry for my sake, but now it was just terrifying.

“Anyway, let’s go to the living room. That Kirino cat got in the way at the cram school, so I couldn’t get you to teach me much.”

She asked me plenty…

Luckily, I was almost done with my test prep, so I had time until the day before the tests.

We sat at the dining table, facing each other as usual.

“So, what do you want help with?”

“This word…”

She could’ve looked up a word on her phone in a second.

For about fifteen minutes, Ayuka kept asking me about super basic stuff.

“Here, big bro and Ayuka-nee, I got the food.”

Fuzuha came back from the convenience store.

“Thanks, Fuzuha. Come on, Bro, let’s eat together.”

Ayuka took the convenience store food from Fuzuha and sat next to me.

“Isn’t your seat over there, Ayuka?”

“That’s just something that woman decided on her own. Always sitting next to you, clinging to you…”

Her tone was starting to slip.

“Huh? Ayuka-nee, you’re sitting there? Then I’ll sit there too.”

“What? You little br— There are only two chairs, so you sit over there.”

She was about to say “brat”!?

Middle schoolers these days call someone a year younger a brat…

“…Fine.”

Fuzuha reluctantly sat across from us.

Without saying grace, the three of us started eating.

Since I didn’t come to the living room yesterday, this was the first time we ate dinner without Rinka.

With Rinka gone, we could watch TV or use our phones as much as we wanted during the meal.

“So, Bro.”

“Hm?”

Surprisingly, Ayuka didn’t touch her phone and kept talking to me.

“When are you dumping that friend with benefits?”

“What!?”

That was close.

I almost spit out the juice I was drinking.

“Friend with benefits…?”

“Obviously, I mean that Kirino woman.”

In Ayuka’s eyes, Kirino-san was my friend with benefits!?

Did I look like the kind of guy who’d have one…?

If I did, that didn’t feel so bad.

“No, Kirino-san isn’t a friend with benefits.”

“Hey, what’s a friend with benefits?”

Fuzuha tilted her head curiously.

Oh no, here came the classic scenario.

The little girl asking about inappropriate words.

“You little br— I mean, kids like you don’t need to know that word yet.”

She almost said “brat” again.

I’ll say it again, you’re only one year apart, okay?

“What? Ayuka-nee, you’re only one year older than me.”

Fair point.

“I’m talking about mental age. You look and act young, so you don’t need to know those words yet.”

True, Fuzuha looked like a girl straight out of a lolicon doujinshi, with a high-pitched voice and a young vibe…

But she was great at brutal video games, so not that childish.

“Fine, whatever! Have fun by yourselves!”

Fuzuha got mad and turned away.

Normally, the older sister would give in here, but…

“So, Bro, when are you dumping her?”

…It seemed the Nuregami sisters lacked a sense of compassion.