Believing She Has Been Reincarnated into a Baseball Game, My Little Sister Is Aiming for the Koshien, While I Give It My All to Keep Her from Finding out That It’s Actually an Ntr Game

“Hello? Is this Riko?”

『Hello! This is Riko! Oh wait, I messed up, it’s Mochi Mochi Riko! It’s not “Hello,” and unlike Onee-chan, I’m not squishy! I’m Mochi Mochi! Good morning, onii-san! As always, your wonderful voice is making my eardrums so happy, but more importantly, why didn’t you pick up your phone?!』

“Ah, sorry about that. I put it on silent mode because I thought I’d be busy for a while… Wait, Onee-chan? You mean Maika, right…? Well, that makes sense, she is squishy.”

『That’s right! Actually, I’m Hyakunogi Riko! I’m not your foolish little sister anymore, I’m Maika-chan’s normal little sister! I’m sorry for lying… I just really wanted to stay as your foolish little sister…!』

“Oh, uh, no, you don’t need to apologize…”

Her voice flowed smoothly through the phone, like she was reading from a script, even the pauses felt pre-planned.

Wait, hold on. Is that really how it is? Is this something we can just casually settle over the phone like this? This is supposed to be a serious matter for Riko, right? She always took pride in being my sister, so how could she confess something like this so easily?

Could it be… Was Maika right to worry after all? Did Riko actually want to stop being my little sister, just like Maika had feared?

No, that can’t be it.

Because, just last month, Riko clearly denied having any such feelings. Sure, when she was little, she wanted to be my wife, but ever since I turned her down, she’s been determined to be the best sister she could be for me.

And for me, Riko is just as important as Maika—the most precious person in the universe.

Even if we weren’t related by blood, that feeling would never change. Ever.

Maybe, over these past two months since I reincarnated, Riko has finally come to understand that.

If that’s the case, then her reaction now makes sense.

『What’s wrong, onii-san? You suddenly went quiet… Could it be that… you’re mad at me, right…?』

“Oh, no, no! It’s not that. I’m really not mad at all. I completely understand how you feel!”

Or at least, I think I do. Yeah, I’m pretty sure I’m right… right?

『Onii-san…?』

“No, it’s nothing, really! Don’t worry about it!”

『…Onii-san, have you perhaps realized… my other secret…?』

Her voice trembled with unease, sounding different from before, like it wasn’t part of any prepared script.

“Riko…”

『The truth is, this call was a last-minute emergency because I had a really bad feeling. You know, like an intuition. For some reason, I can’t help but feel that Maika-chan might have revealed my biggest secret to you…』

That intuition was spot-on. A home run, really. Though, a home run in softball terms. Nine centimeters in diameter… gulp…

“No, no, Riko. It’s not like that.”

Either way, I couldn’t ask her directly. There’s no way I could ask something like, “Do you actually have feelings for me?” Or, “Are you really nine centimeters…?” I couldn’t possibly ask cute Riko that. Not to the most important little sister in the world!

But there was something I needed to ask. With all the shocking things that had happened lately, it had slipped my mind, but it was something I couldn’t forget.

And for this, speed was crucial, whether it was over the phone or not. I couldn’t put it off any longer.

“I didn’t hear this from Maika, but I found out from Nomo and the student council president. Riko, it seems you’ve joined the student council executive board?”

『Oh my, so you found that out too. That one was quick.』

Once again, she admitted it easily. But in this case, that reaction was natural.

After all, Riko didn’t know what joining the student council at Netora Academy really meant. She still thought this world was some kind of baseball game.

『The truth is, after watching all those players dragging down onii-san during practice games, I just couldn’t take it anymore. So, I thought if I became the treasurer for the student council, I could support you behind the scenes. I even managed to arrange this training camp as my first big move!』

“Oh, I see. Thanks, Riko. That really helps.”

Honestly, I didn’t want to have a training camp at all. And frankly, given how free the student council seems to be with their budget, Riko’s influence wasn’t exactly necessary.

But maybe that’s just how things are. Even someone as smart as Riko would join the student council and become a “foolish little sister” in this world. There’s some strange power at work, pushing her towards that, trying to make her fall into the hands of that perverted principal. This world definitely has some kind of will guiding it, some nebulous force.

But I won’t let it have its way.

Yeah, I have more important things to deal with right now. I can’t waste time on this.

『Oh, and one more thing. Just to confirm, onii-san, you’re not falling for Maika-chan’s naughty temptations just because your foolish little sister isn’t around, right? You remember, don’t you? We made a promise! No naughty stuff until after Koshien!』

That’s right. We made that promise. I almost broke it. That was close. Way too close. I was this close to fondling her…

I glanced over at Maika.

She was lifting the hem of her shirt, sniffing it like crazy to check if any of my, uh, fluids had stained it during our hug. Her soft, smooth, squishy belly was fully exposed.

Why does she have almost no body hair, yet her hair down there is so thick? It’s way too sexy. How am I supposed to resist this for another two months? What kind of perverted couple are we?

But even though I’m a pervert, I’m a pervert who stays loyal to my perverted wife. I’d never stand for the kind of pervert who’d turn female students into submissive pets. And the idea that Riko might be dragged into that… It makes me shake with rage.

Riko just called herself my foolish little sister. Even now, knowing we aren’t blood-related, she’s still trying to be my sister.

Maybe she hasn’t fully come to terms with it. Yeah, that’s probably it. She must have mixed feelings.

That’s why I have to keep showing her. I want to keep showing her.

That she’s my most precious little sister in the universe.

And no matter what, that’s never going to change.

I told Riko that I hadn’t done anything inappropriate with Maika and that we’d talk more thoroughly about everything later tonight before I hung up the phone.

Because right now, there was something I had to do first.

I had to run. I had to let my anger explode. I had to make up my mind.

“I’m going to kill that perverted homewrecker principal…!”