Somehow I Ended up Dating the Perfect Female Classmate, but My Sister Found Out and They're Turning Into Yanderes - Chapter 115-116

Chapter 115: Kirino’s 100-Meter Dash

“Alright everyone, keep the line neat and put the girls in front.”

The first- and second-year 100-meter dash was over, and finally it was our turn as third-years.

The all-class 100-meter for the younger kids had the whole ground buzzing with energy because they were actually motivated. But the second it became our third-year turn, our total lack of motivation showed on our faces, and after our E-class military-style march, the excitement on the field dropped like a rock.

By the way, Rinka’s run was nothing short of amazing.

What surprised me most was that she didn’t use a crouch start at the beginning. There’s no special rule against it, but almost every first- and second-year did a crouch start. The other girls running with Rinka did the same.

Even without a crouch start, Rinka was already way ahead from the very first step. She kept that huge gap the whole way and broke the tape in first place. There wasn’t even a dramatic moment—it was like she automatically became number one the instant the race started, and it just stayed that way the whole time.

Everyone watching, students and parents alike, couldn’t hide their shock.
Except for one person—Kirino, who stared at Rinka the entire time without changing her expression even once.

Kirino kept her eyes on Rinka from start to finish, recording every detail like a camera.

This is just my guess, but I bet Kirino was measuring Rinka’s bloodless run with her own internal clock.

Since it was still just a sports festival, they didn’t officially time anyone—they only cared who touched the tape first.

So if Kirino wanted to personally one-up Rinka, she’d have to time it herself and beat that number.

…Like I keep saying, does she really need to go that far?

“Next up, we’ll have the all-class 100-meter dash for the third-years.”

At the signal, the first runners from each class stepped forward.

The running order was by attendance number, with girls going first, so I ended up toward the back while Kirino was pretty early.

“On your marks… get set…”

Bang! The sound hit my ears in a kinda dirty way, and the race finally started.

“Oh, that guy’s in first!”

Right away, someone from E class took first place in their heat.

Finishing first out of five from A to E classes is honestly impressive.

Kirino cheered “Nice!” and called out the name of the girl who ran.

After that, second runner, third, fourth—they kept going one after another.

Our class was putting up some pretty good results.

That’s thanks to Kirino’s reign of terror and the other classes having zero motivation.

And then it was finally Kirino’s turn.

When they said “On your marks,” she quickly dropped into a perfect crouch start.

Unlike a real track meet, the prep time is short, so you gotta hurry.

On “Get set,” Kirino lifted her hips high and made the same clean form she taught me.

…Man, a girl’s crouch start really is a little erotic. If Kirino had been wearing a track club uniform, most of the guys probably would’ve pitched a tent so bad they couldn’t even run straight.

The moment the bang went off, Kirino instantly pulled away from everyone.

Yeah, she really is the ace of the track team.

Her form was completely on another level from the start.

She stayed slightly leaned forward at the beginning, then gradually straightened up as the race went on. She must’ve instantly read the wind direction and adjusted her posture to match.

By the final stretch the gap was overwhelming. Keeping the exact same form the whole way is crazy.

I wasn’t close enough to see clearly, but it didn’t even look like she was breathing hard.

Without any accidents, she kept widening the lead right until she broke the tape.

I bet she beat second place by like two seconds.

Even after crossing the finish line, Kirino kept running, slowly easing off her pace, and when she finally stopped, I could see pure joy on her face.

Oh, she probably beat Rinka’s time.
Wait, does that mean she was mentally timing herself while she was running?

She kept perfect form, timed herself, and instead of slowing down she actually sped up toward the end.

…No one could blame them if they officially suspected doping after that.

Kirino started walking back toward me.

“How was that, Kiyoto? Was I faster than Rinka?”

She already knows the answer but still asks me on purpose.

Let me check—Rinka’s not around, right?
I quickly scanned the area and confirmed she wasn’t nearby.

“Yeah, I think you were faster than Rinka.”

“Yay~ I really didn’t want to lose to that muscle-brained little girl.”

Um… maybe you shouldn’t be spitting venom like that right here?
We in E class already know you can flip personalities, but the other classes don’t. Look, some people are even rubbing their eyes wondering if they misheard you.

Oh, and by the way, since nothing funny happened I’ll skip it, but I ended up coming in second.
Most of the guys and girls in E class took first or second.

And get this—I got second while remembering Kirino’s crouch start and my dick was fully hard the whole time.
Pretty impressive, right?

C’mon, praise me with your feet, praise me~//

—

Chapter 116: Rinka’s Unstoppable Cavalry Battle

“Hey, Rinka grabbed another hat again.”

The whole-school 100-meter dash was over, and now we were watching the first-years’ cavalry battle.

The cavalry battle was split by gender, and since all the classes fought at once, it got a little dangerous.

In fact, during the boys’ round earlier, one guy got his hat snatched so hard he fell headfirst and had to be carried off on a stretcher.

The girls’ side hadn’t seen anything that bad yet, but you could tell there was zero mercy.

By the way, Rinka had already stolen four hats.

Guess that’s what you call a cool-type girl. She didn’t just charge in recklessly—she waited for that one tiny opening, like landing a perfect point in kendo, and snatched the hat clean.

Wait, now that I think about it, why is Rinka even in the rider position with her height?

I know it’s not cool to say this about a girl, but doesn’t the person carrying her get tired because of weight and stuff?

Oh, maybe I should switch with her?

She can use my head as support if she wants.

“So, why’s your girlfriend Kirino standing so close and watching like that?”

Yeah, just like Kouta said, Kirino was still glued right nearby, staring hard at Rinka. Every time Rinka’s horse moved, Kirino moved right along with it.

…Does she really wanna see Rinka mess up that badly?

“Oh, she took another one!”

At this rate, Class A has the win locked up, don’t they?

If the first-year girls from Class A went up against our class’s boys in a cavalry battle, how long could we even last?

We’ve got some guys here who are total masochists, so they’d probably lose on purpose anyway.

If it was our class’s girls, though, it’d actually be a real matchup.

It’d basically come down to Kirino and Rinka in a one-on-one showdown.

And right then—

“Whoa, hey! Careful!”

Rinka had snatched another hat, but the recoil made the girl whose hat got taken almost fall.

Of course Rinka wasn’t gonna let that happen. While still holding the hat, she swung her other arm around and caught the falling girl’s back.

That super cool move from Rinka made the whole field explode with cheers even louder than before.

“…Wait, is she seriously your actual little sister?”

Man, even I’ve been wondering that a lot lately.

Our faces, heights, personalities, the way we talk, our smarts—nothing about us is alike.

Maybe we’re actually step-siblings or something?

Is this gonna turn into one of those stories where the sister finds out her brother is actually her step-brother and then suddenly pushes for marriage?

If that’s the case… I’d kinda seriously wanna see Kirino and Rinka—

Nah, wait, that kind of setup doesn’t make any sense.

It’s already kinda unrealistic that they’d both still be in high school and not know they’re step-siblings.

Plus, doesn’t that whole scene look kinda yuri?

She’s probably saying something like “You okay?” right now, but from here it just looks like a prince-type girl hitting on one of her fan-club members.

Is she planning to take that girl home after this?

…Part of me kinda wants to see that too.

I’ve never actually seen real yuri in person before.

Kirino and Kikujima… yeah, that doesn’t count.

And from there, Rinka’s rampage didn’t stop at all. In the end, she pretty much single-handedly wrecked the entire cavalry battle.

The announcer probably hadn’t expected it to end this fast either, ’cause he sounded a little panicked.

“Uh, yes. Um, since the first-years’ cavalry battle finished way earlier than planned, we’ll move things up a bit. In about ten minutes we’ll start the all-grades ball-toss event. Everyone, please get ready.”

Oh right.

I had to take part in the next one too, didn’t I?

I mean, do we really need ball toss at a high school sports festival?

And since it’s all grades, it’s on a stupidly huge scale too.

“Alright everyone, listen up~”

Before I knew it, Kirino had come back to our base and started the meeting.

“I forgot to tell you guys the strategy for ball toss since we didn’t practice it.”

Huh? There’s a strategy for ball toss?

“When everyone throws balls at the same time, they bump into each other and it gets messy, so I think we should pair up now. The one who’s better at ball games keeps throwing the whole time, and the other one picks up the balls that are rolling around and hands them over.”

That actually sounds pretty smart.

I’m totally trash at ball games, so I’d definitely be the one handing them over.

“Alright, I’ll pair with Kiyoto Nuregami, but everyone else, go find a friend you get along with and pair up too.”

I’m not even gonna mention how it was already decided from the start that I’d be paired with Kirino.

Nobody else complained either—they’re all used to it by now.

“Oh, you guys already made groups? That’s nice to see everyone getting along so well.”

Have you ever heard a “that’s nice” that sounded that empty?

“Okay, for now, split up from your groups and line up neatly in attendance number order without messing up the line.”

…So in the end, we still have to march in for every single event, huh.