How I Ended Up with an Extreme Yandere Landmine Beauty When I Asked to Hang Out with My Best Friend's Sister to Get Better at Talking to Girls

Chapter 27: Yandere Sisters and No-Bra Battle!?

“Ryoya-san ♡ Please wear this smartwatch on both arms today ♡”

“Smartwatch?”

On the train ride, Azuri handed me a black smartwatch and a pink one.

Wearing smartwatches on both wrists… it feels kind of like a downgraded version of that Honda ●-suke fashion sense.

“Where did you get these smartwatches?”

“I saved up my allowance and bought them ♡ The black one is for you, Ryoya-san, and the pink one is mine—we’re a matching couple set.”

“C-couple set!?”

“Yes! During this training process, someday I’ll end up managing every single part of you, Ryoya-san, so I thought smartwatches would be necessary. I bought two during the sale ♡”

Managing every single part… she’s gotta be joking, right?

I feel uneasy about how confidently she states it, but well, I’ll just gratefully borrow them for now.

“Huh? But if that’s the case, why do I have to wear them on both arms today?”

“This is… needed for the Heart-Pounding Diagnosis Game.”

Here it comes—the Heart-Pounding Diagnosis Game.

“Today’s amusement park date has the purpose of getting you used to dating girls, Ryoya-san, but there’s also another goal: we need to find out which one of us—me or Saito-san—makes your heart pound more.”

“Eh! So that’s what you mean by heart-pounding!?”

I glance over at Mayana.

She nods with a completely serious look in her eyes.

“The rules are simple. You wear the black one on your right arm and the pink one on your left arm. Basically, today the only person allowed to touch your left arm is me, and the only one allowed to touch your right arm is Saito-san.”

“Why is it already a given that both of you will be touching my arms!?”

“Because it’s a date, Ryoya-san ♡ Body contact is unavoidable.”

“Uh, uhhh…”

For a while now I’ve been getting an explanation of some incomprehensible game, and on top of that there’s this mysterious logic being rolled out.

“But heart rate isn’t measured separately for each arm, so what’s the point of wearing two?”

“No, the reason for wearing two isn’t that. We’ll measure your heart rate mainly with the smartwatch on your left arm. The reason for two is so we can track exactly how long each of us is touching you.”

“Tr-track?”

“These smartwatches are amazing—they can precisely measure the time an object is in contact with your arm. So I’ll touch only your left arm, Saito-san will touch only your right arm, we’ll collect each other’s data completely separately, track the time periods, and then battle using the highest heart-rate value we manage to earn ♡”

Earn… is my heart some kind of medal-game machine?

“That’s the full explanation of the rules ♡”

“No problem… I’m going to win anyway.”

“No, wait—before we even talk about rules, isn’t this date turning into fighting material between you two instead of my date training?”

‘Next stop〜, ○○〜○○〜’

“Ah, we’ve arrived. So the game starts the moment we step off the train.”

Starts… Azuri really comes up with the weirdest games.

Well, Azuri and Mayana don’t get along, so I guess she wants to compete with Mayana over absolutely everything. Still, I never thought I’d end up being used as the tool for their contest.

I kept blankly thinking about that sort of thing until the train doors opened, and the moment they did I tried to step out right away… but.

“Kyaa, sorry Ryoya-san, I slipped〜”

The instant we exited the train, Azuri rushed at me with the explosive speed and acceleration of a short-distance sprinter and deliberately crashed into my left arm in an obviously staged way.

“Ah ♡”

Heyyy!!

Azuri’s unbelievably large and soft breasts pressed right against my left arm… mm!?

This sensation was far too raw and vivid…

Wait, no way… did Azuri…!

Azuri lifted the corner of her mouth in a sly grin.

“Sorry, Ryoya-san, I’m okay now ♡”

She said that and pulled away.

I’ve never touched them before and I’m still a virgin, so honestly I don’t really know… but that feeling…

No way—did Azuri come here without a bra just for this contest…?

“What’s wrong… Ryoya-senpai?”

“Uh, ah, no, it’s just…”

I’ve been thrown straight into the middle of an absolutely insane match-up battle…!

—

Chapter 28: A (Landmine) Happy Time Getting My Arms Squeezed Between Big Breasts and Big Breasts’ Yandere

That damn Azuri… Is she going braless on purpose just to make my heart race!?

Even before we reached the amusement park, I had already noticed something outrageous.

Up until we got here, I was really excited because it was my first time going on a date with a girl… but that was a huge misunderstanding.

No matter how you look at it, this isn’t just a normal date.

This is, without a doubt, a date that’s actually a battlefield between two landmine-type girls.

Does Azuri really want to beat Mayana that badly?

She probably wants to use my heart rate numbers as proof to claim victory over Mayana, no matter what it takes.

I thought this was going to be an ordinary date… but things have gotten way out of hand.

I need to switch gears too.

“Um… Ryoya-senpai.”

“Hm? Wh-what is it, May…!?”

The moment I turned toward Mayana, she pressed her breasts against my right arm and wrapped her whole body around it.

“W-wait, Mayana-san!?”

“Senpai… just like the rules explained earlier, in this game the more time you spend in close contact, the bigger your advantage.”

She’s starting some kind of weird analysis I don’t fully understand.

“Also, this wasn’t in the explanation we gave you earlier, but when we confirmed the rules just between us, any time both of us are touching you at the same time doesn’t count toward the heart rate. So in extreme terms, if I stay clinging to you like a koala from now until we go home, even if Niijima-san clings to you as much as she wants, I still win.”

“That’s too long! The train noise drowned out half of what you said!”

“Then to put it simply… I’m going to spend the entire day today clinging to Senpai’s right arm.”

“Haa!?!?”

What the hell is this girl even saying!?

“Oh my, look at Saito-san squeezing out every bit of her tiny brain to try so hard~”

“Shut up… What about you? Aren’t you going to do anything?”

No no, notice it, Mayana!

Azuri is already using her ultimate secret weapon—she’s braless!

Just take the money and go buy a bra at any clothing store nearby!!!

“But… constantly clinging like that is actually pretty clever♡”

“No, it’s not even about being clever—if this is allowed then the whole game becomes completely—”

The moment I started speaking, Azuri refused to lose and immediately latched onto my left arm in retaliation.

And on Azuri’s side… u-ughhh!!?

This isn’t even “training to get used to girls” anymore—this is basically straight-up erotic!

“Niijima-san… don’t copy me.”

“It’s not copying♡ This is purely my service to Ryoya-san.”

Both of them started squeezing my arms even tighter.

The sight of two landmine-fashion big-breasted beautiful girls clinging to both my arms like beetles sucking tree sap.

What the hell is this scene!? It looks exactly like those vulgar old internet memes of a sleazy guy walking around with women tucked under both arms!

“Hey, both of you! We can’t even go through the ticket gate together in this position!!!”

With my arms trapped by my best friend’s little sister (landmine) on one side and another landmine girl on the other, I somehow managed to shuffle sideways like a crab out of the station. After that, in every possible sense of the word, I headed toward the amusement park while on the verge of exploding, still sandwiched between the two landmines.