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 23-24

Chapter 23: Side Saito Mayana “The Reason We Kept Missing Each Other in the Toilet Because of a Love That Was Too Heavy” (Mayana’s Perspective)

After Tada-senpai left the room, Shinichi-san and I were once again left alone together in the room.

To be honest, I hate this atmosphere.
The air when it’s just me and Niijima-san.

Even back at school, I never liked Niijima-san.
She does have popularity because of her striking looks and cuteness, but she never hangs around with anyone.

In the cutthroat girl society where people exclude or get excluded, she chooses to stand alone as a landmine-type girl, making her a truly unusual presence even in that fancy girls’ school.

And she has an incredible obsession with everything.
She’s always obsessed with being number one. Her test scores are almost always top in every subject, and whenever she loses to me and comes in second, she keeps glaring at me with a sulky face.

Right now is exactly like that.

She stands by the window in this room, glaring down as she watches her own older brother leave.

“Um, Niijima-san… what exactly are you planning?”

“What do you mean?”

“What do I mean…?”

I turn my eyes toward the skirt Niijima-san is wearing.

“You’re wearing Tada-senpai’s trunks under that skirt, aren’t you?”

I say it straight out without any hesitation.

If you want to hide a tree, hide it in the forest… that comment basically means that if you want to hide senpai’s trunks, the absolute safest place is an area no one can possibly see—inside her skirt.

I’m completely certain of it, and that’s exactly why I can say it so clearly.
Niijima-san is planning to go home wearing Tada-senpai’s trunks…!

“Fufu… ahaha, ahahahaha!”

“Why are you laughing…?”

“Oh, I just thought, ‘Oops, the dummy got caught♡’”

Niijima-san breaks into a wide, delighted grin and laughs out loud in a very satisfied way.

“Huh? Dummy? Then aren’t you the dummy here?”

“In that case, let me ask you something, Saito-san.”

Wh… what on earth is she going to ask?

“You, of all people—how do you know that Ryoya-kun is a trunks-wearing guy?”

Oh no… wait, why do I…!

Because I had treated the perfectly normal fact that Tada-senpai wears trunks as a given in my reasoning, I ended up making this unbelievable blunder.

The information that Tada-senpai’s underwear is trunks is indeed something an ordinary person wouldn’t know…

“Hey, I wonder how you know that?♡”

“Th-that’s, um…”

“Could it be… that you’ve peeked into Ryoya-senpai’s toilet before… or maybe even taken secret photos?”

…!!

Once, a certain little detective said that words are knives.
He was right… that knife stabs straight into my heart, and my past mistake gets dug up by her.

“Saito-san? You’ve been acting like some heroine who appeared to protect Ryoya-kun ever since yesterday… but that’s not the truth at all.”

“What are you trying to say… I was asked by my older sister to—”

“Lies!! You’re not a knight protecting the princess named Ryoya-kun. You’re a monster dripping with desire who’s targeting Ryoya-kun.”

Niijima-san hurls her fierce anger at me through her words.
Sure, even if I’m a monster too, even monsters have things they refuse to give up.

Because the one who made a promise for the future with Tada-senpai at that summer festival… was me.

“…Hey, Saito-san. Since we’re here, let’s make everything clear—black and white. How about a contest?”

“A contest…?”

“A big contest… with Ryoya-kun as the prize.”

—

Chapter 24: The Yandere Staredown and the Start of the Dark Game!

I walked Azuri’s older brother, Shinichi, all the way to the front door to see him off.

It wasn’t exactly that I was running away from that situation or anything, but honestly, I just needed a little breather to reset my feelings.

Azuri has this habit of getting way too close no matter what she’s doing… and the way she talks makes my heart race in a weird way. When she comes at me that strongly, even I can’t keep my mental strength up forever.

“Sorry about Azuri, Ryoya. Must be a hassle.”

“No no, if anything I’m the one who’s being helped here! I’m really grateful to both you and Azuri, Shinichi.”

“R-really? …Well, that’s good then! Azuri usually doesn’t open up to people easily, but I had a feeling she’d be okay with you, Ryoya!”

Shinichi said that while looking genuinely happy and a bit shy.

I guess for a big brother, that’s the happiest thing he can hear.

Azuri slowly opening her heart to others… and me getting more used to being around girls.

Even though Shinichi usually acts like a hot-blooded idiot, what he just said actually made a lot of sense.

“Well then, Ryoya, I’m counting on you to take care of Azuri from now on, okay?”

“Yeah, see you later, Shinichi.”

After seeing Shinichi off at the front door, I went back inside and this time properly locked the door.

“Hm…? I’m pretty sure I locked it earlier too… so why was it open?”

Maybe I should mention it to Dad or Mom later.

If the front door lock is broken, that would be a big problem.

“Right… I’d better get back to my room quick.”

I hurried up the stairs toward my room on the second floor.

I wonder if those two are getting along okay?

If they start a huge fight in my room and trash the place, I’m going to be in serious trouble… but surely it won’t come to that.

“Sorry for the wait—”

When I opened the door to my room, the two of them were sitting face-to-face, glaring at each other intensely.

It looked exactly like the silent staredown fighters give each other at a pre-fight press conference.

“W-wait, wait, why are you two glaring at each other like that!”

“…Ryoya-san. Just now, Saito-san and I came to an agreement.”

“An a-agreement?”

“Yes… I can’t go into detail about it, but anyway—how would you feel about the three of us going out together this weekend, if you’re free?”

Going out on the weekend… wait, the three of us!?

“I-I mean, sure, I don’t mind… but what are we doing?”

“Of course♡ It’s practice for going on dates♡”

“D-dates!?”

“Yes♡ And while we’re at it, we’re going to play the Heart-Pounding Measurement Game♡”

H-heart-pounding measurement game…

Another dangerous-sounding phrase just popped up, huh.