I Got Reincarnated as the Scummy Dude Who Sends NTR Video Letters to Otaku Guys in Erotic Manga, But When I Tried to Steal His Girlfriend, I Accidentally Hooked Up with Her Twin Sister Instead - Chapter 18

Chapter 18: Lie Detector

――Lie detector.

Y’know, the thing cops use in dramas during interrogations. They ask questions and the machine figures out if the answers are true or lies.

I don’t really know the details—like whether it checks heart rate or brain waves or whatever—but it’s some scientific gadget that’s supposed to catch lies.

“With this, I’m gonna strip Nedori-kun bare.”

Yui pulled out this machine that no normal person would ever buy, looking all excited and happy about it.

She hooked it up to my finger right away and said in this super calm voice,

“Now I’m gonna ask Nedori-kun a bunch of questions. Answer every single one with ‘yes’ or ‘no.’ If you stay quiet, electricity’s gonna run through you, so please don’t even try it.”

“Uo? Electricity?”

“It’s just a little electric shock kinda thing. Oh, and if you lie, electricity runs too, so be totally honest with everything.”

For real? This is exactly what I pictured a lie detector being.

That said, the thing in front of me wasn’t some fancy police-grade model—it looked exactly like a cheap toy you’d see in a party game.

“By the way, any guarantee it won’t glitch?”

“Nope. I’ve never used it before.”

“Yeah, figured… How much was it?”

“Three thousand yen during the Golden Week sale.”

“That’s definitely the low-accuracy version.”

“……………………”

When I pointed that out, Yui awkwardly looked away.

But whatever, can’t really blame her.

A lie detector you can buy with high-school pocket money isn’t gonna be anything serious.

“Ahem…”

Yui cleared her throat, brushed it all off, and flashed a huge smile.

“It might accidentally shock you, but let’s pull ourselves together and get started anyway.”

I had a ton I wanted to say, but I swallowed it all and focused.

If it’s reading heart rate to tell lies from truth, I gotta stay calm and centered.

I took a big deep breath, and Yui started.

“Okay, first question. Nedori-san, how old are you right now?”

“…Sixteen?”

I answered nice and calm. No shock came.

“…Wrong?”

Of course it was. Nedori Ren being sixteen is 100% fact. My birthday’s coming up soon and I’ll be seventeen, but still.

“Hold up, aren’t I supposed to answer ‘yes’ or ‘no’? The question itself is already off from the start, isn’t it?”

“Okay then, let’s change how I ask.”

Yui just breezed right past it with a straight face.

Today’s Yui feels kinda… clumsy?

Maybe she’s more panicked than usual?

No idea why she’s panicking, but either way it worked in my favor.

“Second question then. Is this the second time you’re studying high school stuff?”

“……………………”

“Answer please.”

I couldn’t reply right away.

‘Cause if I said ‘yes,’ it’d blow my cover that I reincarnated.

But at the same time, since she’s asking this question at all, lying probably won’t help anyway.

Getting zapped sucks, so maybe being honest here is—

“UhyaaaaaaAAAAAAHHHH!!”

Right then, electricity shot through my finger. Felt like a really strong static shock—bam.

It didn’t hurt that bad, but it was enough to make me jump.

“Three thousand yen and it shoots shocks this strong—uhyaaaaaaAAAAAAHHHH!!”

Another zap hit.

Was it ’cause I was just talking normally? No clue, but man, that felt awful.

“Nedori-kun… are you maybe enjoying this?”

“No way! I’d take getting my ass whipped a hundred times over this!”

I declared it loud and proud. Yui’s eyes went all complicated.

“…Sorry. I must’ve whipped you too much and unlocked a new kink, huh.”

“No that’s not it! I’m not saying I wanna get whipped or anything!”

“……………………”

But Yui didn’t say anything more.

Damn it, she totally thinks I’m a perv now.

“I’ll ask the same question again. Is this the second time you’re studying high school stuff?”

Looks like she’s gonna keep asking till I answer.

If I say ‘yes,’ it’ll prove I’m repeating high school. Normal high-schoolers don’t study the same stuff twice.

Wait… hold on?

“Uo?”

Suddenly my inner grade-obsessed side woke up.

Yeah. That’s right. How did I not think of this sooner!

“The answer’s ‘no’!”

I grinned, finally seeing it all clearly, and said it. No shock, obviously.

Makes sense. ‘Cause including my previous life, this is my third time doing high school.

Yeah—back in my past life, I was a ronin.

When I was still in high school the first time, I got cocky thinking “Three months and MARCH is easy,” slacked off, and failed every exam.

Learned my lesson, so during ronin year I studied like crazy—ten hours a day.

Ended up getting into a national university, but yeah, that meant redoing all the high school material.

So counting my past life, this is round three. Not two. So the answer to Yui’s question is straight-up ‘no.’

“I see… But that can’t be right…”

Yui tilted her head, looking suspicious at my answer. Probably thrown off by something she didn’t expect.

—Man, good thing I flunked into ronin life.

Not really good at all. The pressure from my parents was insane.

“Okay. Third question then. When did Nedori-kun lose his virginity for the first time?”

“Just recently. Doing it with Yui was my first.”

“……Then next. Who was your first girlfriend?”

“Yui.”

“And the first girl you ever kissed?”

“Yui.”

After that I just kept answering.

Yui’s questions were definitely stripping me bare in a way, but none of them were gonna nail down my real secret.

Big thing is, in my past life I was a forever-alone virgin—time single equaled age single. So any girl-related questions pretty much have to involve Yui.

“……Okay, let’s wrap this up with the next one. If I don’t get confirmation soon I might get too excited and just jump you.”

“Uo?”

Getting my chastity threatened during a lie detector session is messed up.

If I self-censor mid-interrogation I’ll get zapped and it’ll be way worse.

Yui put a hand on her chest like she was trying to calm her racing heart, then spoke in that flat tone again.

“I’ve got a theory that Nedori-kun has memories from a previous life, or maybe you time-leaped.”

“I-is that so.”

Sweat started dripping down my forehead.

“Since you’re locked up with me right now, I think the time-leap possibility is pretty slim. So the odds you’re carrying past-life memories are super high. So here’s the question. Straight to the point.”

Yui leaned in close—close enough I could feel her breath.

Staring straight into my eyes from point-blank range, she finally hit me with the real one.

“Nedori-kun!”

“Do you——have memories from a previous life?”