I absolutely hated NTR. I’d say it again. I hated netorare.

Your senpai from the club? Your brother’s friend with benefits? Your best friend? A massage therapist?…stole your lover?

Fallen to pleasure? Infuriating developments? Bad ending?…Your lover was stolen?

Seeing your beloved person moaning with someone else and falling into despair?

Die! Die! Don’t mess with me! Outsiders should just stay out of it!!!!

I’d once broken a game disc into pieces over this. My friend who’d lent it to me had been furious… Sorry about that.

I also hated reverse NTR, where a beautiful girl stole the protagonist’s lover.

If the heroine was trash… then sure, I could understand why she deserved to be cheated on… That was still somewhat acceptable. But stealing from a pure and devoted heroine was absolutely wrong no matter how you looked at it!!

“Even though I had a girlfriend, I couldn’t resist when the mischievous kouhai I helped began seducing me…”

This sounded exactly like the title of a NTR eroge. The art style was so much to my liking, and I’d fallen in love with the heroine on the package at first sight, so I’d bought the game without checking it properly… and regretted it to death.

To put it simply—it was a garbage game.

The protagonist and his childhood friend heroine had been dating for a year, but because the protagonist was a wimp, they hadn’t progressed to having sex. Their relationship hadn’t changed much from when they were just childhood friends.

Then one day, the protagonist helped a junior student, Nanaka Seo, escape from some guys hitting on her, and the two became close.

No… more like he was targeted and seduced.

This pure-looking but actually promiscuous junior, Nanaka, with her erotic body, seduced him with a sweet, purring voice while touching his body. She used her feminine wiles on him, completely disregarding the fact that he had a girlfriend named Haruka. She tempted him to cheat with her seductive whispers, verbal teasing, ear-licking, and handjobs.

Gradually, the protagonist became attracted to her voluptuous body, more sexual than Haruka’s. He surrendered to her sweet whispers and… eventually had sex with her before doing it with Haruka. When she took photos as evidence, the protagonist became her puppet…

And the worst part was the ending.

Nanaka actually sent a video of their intercourse to Haruka. From that video, Haruka awakened to a netorare fetish, and eventually even volunteered to help with the filming, blooming into her hidden perverse nature… the story concluded with such a terrible ending.

There were three other routes, but all of them were terrible.

Ptooey!!!! Ptooey!!!!

Just date that pure, innocent, cute childhood friend turned girlfriend properly, damn it—!!!

Why would someone look at other beautiful girls when they had such a cute girlfriend? Why would they actively have sex with an aggressive promiscuous girl when provoked?

The real problem was the female character who came between the lovey-dovey couple and tried to steal him away. Wouldn’t it be better to just reform the heroine who was trying to do the stealing?

With such anger in mind, I fell asleep.

The next morning. I was looking at my face in the mirror.

“Huh? Who is this?”

I’d been confused for about two minutes now.

What was reflected should be my usual face… but the face in front of me was someone else’s. An ordinary face with black hair.

“Shotaro! Breakfast is ready!”

A voice that sounded like a mother called for someone. Probably me.

This wasn’t my house. And this was someone else’s body. I must have transmigrated into a different world. And I didn’t recognize this guy. Which meant…

“I’m a background character.”

A background character who didn’t show their face, just appearing in text. A background character with a really nice voice though.

Background character, huh…

“Big brother! I need to use that space, so hurry up and move!”

What appeared was a beautiful girl in a sailor uniform with twin tails.

“Ah, I’ll move now…huh?”

Big brother? If she was calling me big brother, that meant… a sister! A sister?! How did a mere background character have such a cute sister… Well, I guess she was my sister now.

“Why are you tilting your head, stupid brother? Hurry up and go.”

“Sorry, sorry. I was just captivated by my cute sister’s face.”

“W-what?! W-w-what are you saying, stupid brother! I-it’s not like I’m happy to be complimented by you or anything!”

My sister’s face turned bright red.

Hmm, a tsundere… I definitely wanted to explore the sister route.

Chapter 2: Well, I’m Just A Mob Character, So Let’s Get Close To the Beautiful Girl Who’s The Other Woman!

I discovered what world I had been reincarnated into. How did I figure it out? From the school name.

—Hiiragi Academy. [Even Though I Had A Girlfriend, I Couldn’t Resist Being Seduced By The Mischievous Kohai I’d Saved…] abbreviated as… Well, let’s just call it a NTR eroge. The school name was exactly the same. School names almost never coincided like this.

It seemed I’d somehow become a mob character in a netori eroge.

Hm? Why was I so calm about this? Well, any otaku had fantasized about this kind of scenario at least once, right?

“Mom already left for work. I made pancakes today. There’s also crispy bacon, so eat it before it gets cold.”

My sister Mina said this. On the dining table, there was an elaborate breakfast laid out, starting with delicious-looking pancakes.

“Did you make all this, Mina?”

“Yes, but… i-it’s nothing unusual, right? Why are you so surprised… Big brother, you’re acting strange today. Did something happen?”

Well, that was because someone else had taken over your brother’s body. A tsundere, devoted sister for a mob character? Could this be a hidden character route?

“Hey, Mina, tell me what the usual me is like.”

“Um, a gloomy loner, shabby and creepy.”

“You’re being incredibly direct.”

“Well, it’s true. You’re always anxiously fidgeting about something, which is creepy… If you were always decent like you are now, you’d be somewhat cool…”

“Oh? So Mina prefers this version of her big brother?”

“W-what!? You heard that!? Gross. W-well… at least I can have a proper conversation with this version of you, so I like… it.”

What an excellent tsundere sister.

“Hmm, that must be the heroine who plays the role of the other woman.”

After waiting at the school gate for 30 minutes, I finally spotted my targets.

Finding specific students would normally be difficult, but fortunately, they stood out more than anyone else.

A group of three approached.

“Hey, you two, give me some space! We’re really standing out!”

The guy sandwiched between two beautiful girls was definitely the protagonist of this netori game.

The protagonist, Haga Isamu, was an incredibly good-looking guy. Not just his face, but his personality was also annoyingly perfect. His parents were overseas, leaving him to live alone—a classic setup. He had a muscular physique and was excellent at housework. Being kind to everyone on top of all that, it was no wonder beautiful girls were attracted to him.

On either side of him were beautiful girls. One with chestnut-colored hair in a ponytail and an energetic appearance, and another with short black hair who looked refined and proper.

My target was the pure-looking one. The protagonist’s underclassman one year below him, Nanaka Seo.

Rumors said she dated a different guy every month, but nobody knew the truth. However, her true nature was that of a seemingly proper girl who was actually promiscuous, seducing any guy she liked regardless of whether he had a girlfriend or not. She had loose morals and considered erotic things like touching or kissing as mere skinship.

From the looks of it, this must be after he’d helped her escape from some pickup artists.

She liked the protagonist and approached him with a sweet, purring voice and aggressive advances, constantly confessing and tempting him—that was roughly Nanaka’s character setup.

“N-Nanaka-chan! Ii-kun is MY boyfriend! Even if you’re close friends, you don’t need to join us on our morning walk to school!”

“Come on, Haruka-senpai. This level of skinship between me and senpai is just our normal routine. Right, senpai?”

“Ugh, y-yeah…”

Looks like they’d gotten quite close. At this rate, it was only a matter of time before she stole him…

No one interfered with these three; they just watched from afar, biting their fingers. I wouldn’t do that. Why? Because if I left them alone, we’d head straight down the netori route. However, if a random side character suddenly approached them, they’d find it strange.

So there was a way to make them remember my face.

“Huh? Is that guy an acquaintance of you two?”

“I don’t know him.”

“Me neither, senpai.”

The three of them were confused by my sudden appearance blocking their path.

Good, good, their attention had shifted to me.

I bowed my head at a 90-degree angle, straightened my arms, and spoke clearly.

And then, I said—

“It was love at first sight! Please go out with me, Seo-san!!”