Transmigration to Prevent NTR
Transmigration to prevent NTR. It was something I had never even imagined. Still, I wasn't stupid enough to reject the truth when it hit me. I'd read enough novels in my previous life to know the drill.
In my last life, I'd been an ordinary guy. Ordinary parents, an older brother, and me. The four of us were a perfectly normal, happy family, and I was just a student who loved sports.
"Oppa!"
In short, I never had a little sister who called me that.
When I looked up at the voice calling me, I saw a girl staring with her cheeks puffed out. Jet-black hair and equally black eyes. Her silky strands swayed gently, gleaming with careful care, while her snow-white skin shone even brighter by comparison.
Her delicate, refined features were both cute and stunning. I froze for a moment, stunned by how much more beautiful she was in person than in any illustration, but the memories flooding back quickly snapped me out of it.
Natsumoto Haru. In the original story, she was the lively, energetic little-sister-type heroine. Her beauty, adorable personality, and boundless cheer had made countless readers' hearts race. At least until the middle of the novel.
But once the latter half began...
She, too, was merely a heroine stolen by another man. In an utterly vile and filthy way.
The novel had included graphic descriptions of the NTR. What started as an all-ages story would release one adult chapter every twenty episodes, but after stacking up four hundred of them, it dumped every single explicit scene starting from chapter 400. All of them were sex scenes with the men who had stolen the heroines.
Scrape.
"Oppa?"
The moment those memories surfaced, nausea surged through me. I clutched my churning stomach, kicked my chair back, and bolted for the bathroom.
"Ugh... bleeegh...!"
I gripped the toilet bowl and emptied everything that rose from my empty stomach.
"A-are you okay?"
"Ugh...!"
It seemed the mental damage ran deeper than I thought. Just recalling it brought another wave of vomiting. No... something was wrong.
Scenes played in my head like a movie, crystal clear. The images were so vivid I wondered if I'd always had this kind of imagination. They tore through my mind and stomach alike.
The urge to throw up kept rising. It felt as if someone was screaming at me that I had to change those scenes.
I swallowed back the bile burning my throat and wiped my mouth with my sleeve. Trying to regain cold reason, I stared down at the toilet and replayed the visions that had just flashed through my mind.
Absolutely. I cannot allow that to happen.
"...I know that already."
I let out a long breath, and the nausea vanished in an instant. Still sitting on the floor, I steadied my breathing for a moment before standing up again.
"Oppa? Are you really okay?"
What a kind child. Beyond her brightness and beauty, she was genuinely gentle and good-hearted. Exactly as she'd been described in the novel. Her worried tone carried that warm personality clearly.
I forced a smile and nodded.
"Sorry, sorry. I'm fine now."
"Geez... you scared me!"
What an idiot. She looked relieved by my words and smiled, then turned back toward the dining table. Watching her, I calmed the turmoil inside me.
"NTR is absolutely not happening."
"...Hm? Did you say something?"
"Nothing."
Even if dirt gets in my eyes, that one thing will never be allowed.
I calmly turned the gears in my head and followed Haru.
How could I return the story to its original flow? The answer was simpler than expected. I knew the entire plot of this novel to its conclusion, and now I had become one of its characters.
"Here! Sit down quick! It's your little sister's special breakfast today!"
"...Got it."
Just as I originally had no little sister, Natsumoto Haru originally had no "oppa." My existence in this world had created her older brother. Yet she didn't find it strange at all. She seemed to accept it as completely natural.
And having become her older brother, I was grateful for it.
Haru liked the protagonist, Daiki, and followed him everywhere. In other words, it gave me natural points of contact with him. Feeling relieved by that fact, I sat across from her and continued eating.
It's delicious.
Just like in the original novel, Haru was an excellent cook. She always made lunches for Daiki, and he loved her cooking. While reading, I'd often thought how much I wanted to try one of Haru's lunches... Eating it now filled me with indescribable emotion.
I ate in silence for a while, then chose my moment and spoke.
"By the way, how are things going with Daiki?"
"Pffft!"
Yeah, as expected. In a love comedy, of course she'd spit out her food at this timing.
I raised my hand and lightly blocked the grains of rice that flew from her mouth. Her face turned bright red.
"W-what are you talking about, O-oppa?"
"Huh? Don't you like Daiki?"
From Haru's reaction, it didn't seem like the story had reached the point where she no longer had feelings for him. Since the easiest way to figure out how far the novel had progressed was to ask her directly, I kept my expression casual and continued.
"T-that's true, but! We... we aren't anything yet!"
"Really?"
"Yeah... B-but we promised to hang out together at the summer festival this year! Yep! I'll do my best then!"
The summer festival, huh. It was probably the promise from chapter 386. Nodding as I listened, I began carefully turning over the novel's contents in my mind.
This was quite far into the latter half. It seemed the person who had presumably transmigrated me here—the author, most likely—wanted to skip the early stages and jump straight into the main plot.
...That's inconvenient.
I needed to figure out what position I held in this world, how close I was to the protagonist's group, before making any plans. At this rate, it was basically diving in blind.
"I see."
While my mind wandered elsewhere, I gave a vague reply to Haru's words. Then she glanced at the clock and yelped, snapping me back to attention.
"Ah!"
"...What's wrong?"
"We're going to be late! We have to hurry!"
There was still plenty of time until homeroom. Realizing something, my eyes sparkled as I stood up.
"Hm? You're going out too, Oppa?"
"Yeah. Let's go together."
She tilted her head briefly, wondering why we weren't going to school together despite attending the same place, then gave a big nod and hurried to get ready.
"Okay! Hurry, hurry!"
"Yeah, yeah. I'm coming."
What comes to mind when you think of love comedies? I pondered this as I followed Haru. Naturally, it was the protagonist and heroines walking to school together in the morning. Morning commute events were basically law in the genre.
Haru would want to start her mornings with Daiki too, so following her would naturally lead to meeting him and the rest of the group.
Plus, it'll be easier to drop hints later if I talk to the protagonist through Haru.
Our house was a large standalone residence. Daiki's villa was about five minutes away—not too far. And since the school was closer to our side, leaving at the same time meant...
"Daiki oppa! Akase unnie!"
"Ah, Natsumoto-san."
"Good morning, Haru-chan!"
We would run into the protagonist's party.
Black hair and black eyes. Similar to me and Haru, yet different.
...The textbook love-comedy protagonist.
He had that awkward, introverted vibe. Skinny, with zero masculine presence. Beside him stood a girl with purple hair and purple eyes.
Akase.
The classic childhood-friend character who always appeared in love comedies. She'd lived next door to Daiki since they were three, and they'd been friends ever since. The moment I saw her, I nearly burst into tears.
No matter how much I loved all the heroines, there was always a clear favorite among them. The one commonly called the "main wife." Suzuki Akase was the one I pushed hardest for that role.
Her gentle expression and tone, modestly full breasts, slender waist... She had the kind of figure that looked perfect in reality. She was my absolute favorite among favorites.
The moment I saw Suzuki Akase, my chest swelled with emotion. At the same time, my mind grew coldly calm.
I knew all too well how her blind love for Daiki, her fifteen years of devotion, and her tender, profound feelings would all shatter.
I bit my lip without realizing it.
"Good morning to you too, Natsumoto-kun!"
"Ryu, you're out early today, huh?"
But I quickly pulled myself together at the sound of Daiki and Akase's greetings.
This is going to be a headache.
Every time I looked at the heroines, scenes of them being NTR'd flashed through my mind like a film reel. Just seeing Akase and Haru was enough for me to reach a conclusion.
These weren't my memories. I didn't possess this kind of imagination. It was as if the world itself was showing me the "future."
And I fully intended to stop it, no matter what.
"Good morning."
I raised my hand in greeting as if nothing was wrong and renewed my resolve once more. This wasn't a game or a novel. It was the world I lived in. The world I would continue to live in.
In this world, NTR would never exist.