Somehow I Ended up Dating the Perfect Female Classmate, but My Sister Found Out and They're Turning Into Yanderes - Chapter 36-37

Chapter 36: Encounter on the Way Home

“Isn’t this a failing grade?”

I heard Kouta Akasata mutter that on the afternoon of the last day of tests.

“You’re a third-year and still failing? You should be ashamed.”

“Shut up! Unlike you, I don’t have a smart girlfriend to study with!”

Is this the cry of a loser?

Don’t worry, Akasata.

Even if the world turned upside down and you got a high-spec girlfriend slightly less amazing than Kirino-san, you’d still fail.

Honestly, the tests at this school are mostly straight from the workbook. If you memorize without thinking, you’d get over eighty points.

I admit the material we had to memorize this time was a lot, though.

“Oh, Kiyoto-kun, let’s walk home together.”

Kirino-san’s beautiful voice comes from nearby.

“Sorry, Akasata. Kirino-san’s calling, so I’m going.”

“Grrr!”

Yeah, yeah, acting like a monkey to switch to a cute guy vibe won’t work.

I leave through the school gate and walk home with Kirino-san as usual.

“Kiyoto-kun, how did the tests go?”

“They went great! All thanks to you, Kirino-san. Really, thank you.”

“No way. I know better than anyone how hard you worked.”

But honestly, this time it’s seriously thanks to Kirino-san.

The first-semester tests in third year determine your grades.

So, this time, the material was huge for all subjects.

Especially classics—there were like fifty pages.

Kirino-san accurately predicted which parts would be on the test.

I told Akasata otherwise, but without Kirino-san, I’d have failed for sure.

“By the way, Kiyoto-kun, how many summer cram school sessions are you joining?”

“I haven’t decided exactly, but I want to go most days when I’m free.”

Usually, “free days” means days I plan to skip.

“Then I’ll see you a lot, Kiyoto-kun. I’ll make you study even more—”

“Huh? Big brother?”

Someone interrupts Kirino-san.

I look toward the voice.

“Fuzuha?”

Fuzuha is standing there, heading home from school.

Middle school tests end in the morning.

Third-years have club activities starting the last day of tests, but Fuzuha isn’t in a club, so she can go home now.

“Um, who’s that…?”

“Oh, I’m Kirino Kinui, Kiyoto-kun’s girlfriend.”

Kirino-san’s boldness in declaring she’s my girlfriend shows how big-hearted she is.

“Now that I think about it, your voice sounds familiar. Fuzuha-chan, right? Oh, you’re the little sister who interrupted when Kiyoto-kun and I were gaming.”

Right.

Kirino-san and Fuzuha have met once.

…This is a bit awkward.

That day, Fuzuha suddenly unplugged the game code and ended it.

She apologized to Kirino-san afterward, and Kirino-san didn’t seem mad, but…

“You interrupted, and then my connection with Kiyoto-kun got cut. I was shocked. I heard later you unplugged the game code.

So, why did you do that? Why did you steal my precious time with Kiyoto-kun?”

Whoa, she’s super mad!!

Her face looks relaxed, but her eyes aren’t smiling at all—classic!

“So… you’re… you’re…”

Huh? Fuzuha?

Something’s off with Fuzuha too.

“You’re the one who tore Ayuka-nee and Rinka-nee apart!!”

Fuzuha, usually so shy, shouts with rage and lunges at Kirino-san.

But she’s just a girl four years younger.

Kirino-san steps aside easily, and Fuzuha falls to the ground.

That dodge was so graceful, I can’t help but stare.

“No, Fuzuha-chan. You can’t just attack like that.”

Kirino-san steps closer to Fuzuha, who’s on the ground.

“Now, can you answer my question? Why?”

Fuzuha, who scraped her knee from the fall, trembles in pain.

Kirino-san doesn’t mock her or help her—she just stares down.

“F-Fuzuha, are you okay?”

I rush over and check her knee.

“It’s pretty bad. Sorry, Kirino-san, we need to get home.”

I lift Fuzuha with both hands.

“Hmm, I was in track, so I scraped my knees a lot. This doesn’t seem like a big deal.”

“Huh?”

“But I still haven’t gotten an answer from Fuzuha-chan.”

Kirino-san keeps staring at Fuzuha with her eyes.

Fuzuha, scared, avoids eye contact.

“S-Sorry, Kirino-san, I’ll call you later!”

This isn’t going anywhere, so I carry Fuzuha and leave quickly.

I don’t know what kind of face Kirino-san made as she watched me go, but I felt the warmth on my back drop.

—

Chapter 37: Sense of Crisis

“For now, putting on a bandage should be fine.”

When I carried Fuzuha home, Rinka quickly brought the first-aid kit.

As Kirino-san said, it was just a scrape, so a bandage was enough.

“Sorry, big brother. I acted like it hurt more than it did.”

“No, it’s okay. I was just surprised. You were pretending it hurt that much?”

“Yeah. I really wanted to keep you away from that Kirino woman.”

A chill runs through me.

To think Fuzuha planned to act like that just to keep me away.

“Hey, big brother. That Kirino person gives me a bad feeling. You shouldn’t hang out with her too much.”

Fuzuha’s face doesn’t show hatred for Kirino-san but looks like she’s genuinely worried about me.

“What are you two talking about? Kirino? Who’s that?”

Right, Kirino-san’s existence was erased from Rinka’s mind.

“There’s still time until dinner. You’re both probably tired from tests. Rest well.”

Rinka says kind words to us.

Oh, wait.

“Rinka, don’t you have club today?”

For high schoolers, except third-years, club activities start on the last day of tests.

So, it’s weird that Rinka’s home this early…

“Yeah, I decided to take a break from club for a while.”

“Huh? Why?”

“I’ve been acting selfishly all this time. It’s strange to practice kendo to improve myself, right?

Before improving, I need to reflect on myself. So, I’m pausing club for now.”

That sounds cool, but it’s not just skipping… no way.

Rinka means it sincerely.

“Then I’ll rest in my room.”

I stand up and head upstairs.

“…Suddenly, I feel so empty.”

Seeing my bed makes me feel empty, so I must just be sleepy.

I toss my backpack aside and lie on the bed.

When I blink once, like a slideshow, Rinka appears in my room, which was empty before.

“Whoa!!”

I jump up from the bed in surprise.

“Why are you shocked? I told you. Dinner’s ready.”

“Huh, it’s already that time?”

I check my phone, and it’s almost 8 p.m.

I must’ve fallen asleep with that one blink.

“Come downstairs quick.”

So, everyone’s there except me…?

Even Ayuka?

Half-doubting, I enter the living room with Rinka, and as expected, Ayuka isn’t there.

Not only that, no meal is prepared for Ayuka.

This isn’t just today—since Rinka’s apology on the first day of tests, no meal has been made for Ayuka.

Ayuka’s eating out with friends, so she’s not starving, but I realize I can’t fix things between them anymore.

“““Let’s eat!”””

Today’s dinner is like an expensive steak meal from a family restaurant.

“…Where do you get steak like this?”

“You can easily find it at a fancy supermarket a bit far away.”

What’s a fancy supermarket?

“I trust you got grades that match this steak.”

Normally, I’d flinch here, but thanks to Kirino-san, I don’t this time.

Wait, she’s still concerned about my grades…

Didn’t she tell Fuzuha to get a score she’s satisfied with?

“By the way, Kiyoto.”

“Hm?”

“Is the first day of summer break free?”

“Yeah, it’s free.”

The first day usually has no plans.

“Then, um, want to go somewhere together…?”

Is this… a date invitation?

With Rinka?

But I have a girlfriend…

“S-Sure, okay.”

Going out with my real sister doesn’t count as cheating, right?

“Going out together…?”

Fuzuha looks a bit lonely.

…Right.

She wants to come too.

Should I invite her?

“Hey, if you want, Fuzuha—”

“Kiyoto.”

Rinka’s quiet voice cuts me off as I try to invite her.

“I want to go with just you.”

Rinka looks straight at me.

What guy could say no to such a cool person asking to go out together!?

“Fuzuha… can you stay home?”

“Yeah, yeah.”

Fuzuha sighs, exasperated.

Then Rinka speaks again.

“No, it might not just be staying home.”

“Huh? What do you mean?”

“Maybe we’ll end up running away together.”

…No, that’s definitely not happening.