Chapter 8: I Might Not Be Able To Become Your Little Sister, But If You Marry My Big Brother, I Can Become Your Sister-in-Law!

After that, the three of us left the classroom. We changed from our indoor shoes into our outdoor shoes at the shoe lockers and started heading home.

Just like that morning, the gazes from everyone around us were absolutely overwhelming. Needless to say, I couldn’t relax at all.

“By the way, Ryoya, what were you worried about earlier?”

“I’ve been out of school for almost two weeks, so I have no idea what’s going on in class anymore.”

“I figured as much. You were holding your head in your hands during physics and math, too.”

“Huh? How do you know that?”

“Because I’ve been watching you the entire time during class, Ryoya-kun.”

“Come on, pay attention to the actual lessons!”

Just imagining Reona watching me the entire time was honestly pretty horrifying.

“Anyway, if things stay like this, I’ll have to attend remedial classes during summer vacation. I want to do something about it, but I can’t think of any good solutions.”

“Then I’ll teach you, Ryoya. That should be enough to help you avoid failing.”

“Huh?!”

I was taken aback by Riona’s sudden suggestion.

She had her own exams to study for, so would she really have enough time to tutor me?

While I was wondering about that, Reona began speaking with a proud expression.

“Riona has ranked first in our school ever since she enrolled, so I think she’s perfect for the job! I also ask her to teach me pretty often, since English is the only subject I’m particularly good at.”

“Teaching Ryoya is easy for me. It’s a piece of cake.”

I’d always thought of Riona as the intelligent, academic type, and apparently, that impression hadn’t been wrong.

“So leave it to me.”

“…Are you really sure?”

“Yeah. I want to help you, Ryoya.”

When I asked her again, Riona answered without hesitation.

Reona, who’d been watching our exchange from the side, smiled happily and spoke up.

“Great! Then it’s settled. There’s not much time left before the exams, so let’s get started today!”

“Huh?! Today?!”

“The sooner, the better!”

“Then let’s head straight to Ryoya’s house.”

This was all happening far too quickly, but Riona seemed so enthusiastic that there was no way I could refuse her.

After walking together for a while, we eventually arrived at my house.

“I’m home!”

“Welcome home, Big Bro—Huh?!”

Mio, who apparently had already returned home, came out to greet me. However, the moment she saw the two girls standing behind me, she froze with an utterly shocked expression.

“Hello! We’re borrowing Ryoya-kun for a little while.”

“Excuse us for coming in.”

“Sorry, this is a little sudden, but we’ve got guests today.”

“…Big Brother, come over here for a second.”

After finally snapping out of her daze, Mio grabbed my hand and dragged me into the dining room.

“Why did you suddenly bring the idol twin sisters of Amaki High School home?!”

“W-Well, they insisted on coming over…”

“I heard that you saved Reona-senpai and Riona-senpai from that random attacker, Big Brother, but I honestly can’t believe they’d actually want to come to our house!”

“Believe me, I’m the one who finds this the hardest to believe. Anyway, it’d be rude to leave them waiting too long, so let’s go back.”

Mio still seemed to have more questions, but for the time being, I decided to return to the entrance, where I’d left Reona and Riona.

“Sorry for keeping you two waiting.”

“It’s fine! Riona and I were the ones who suddenly showed up at your house, after all. More importantly, we haven’t introduced ourselves to Mio-chan yet, have we? I’m Tsurugi Reona, Ryoya-kun’s classmate. Nice to meet you!”

“I’m Riona. Nice to meet you.”

“I-I’m Yagami Mio, Big Brother’s little sister. It’s nice to meet you.”

Mio seemed incredibly nervous.

Incidentally, Mio attended Amaki Junior High School, the junior high division of Amaki High School. Apparently, the Tsurugi sisters were famous there as well.

Quite a few students admired them, and as it turned out, Mio was one of those students.

“Mio-chan, you’re really cute!”

“Yeah. It’s hard to believe you’re Ryoya’s little sister.”

“We’d love to have you as our little sister!”

Reona and Riona seemed to have taken a liking to Mio, judging by their comments.

Mio looked delighted, and her expression visibly softened.

“Don’t go stealing my little sister without permission.”

“I might not be able to become your little sister, but if you marry my big brother, I can become your sister-in-law!”

“Hmm, that’s a good idea.”

“Okay, then! Let’s go to the city office right now and get a marriage registration form. If you write either my name or Riona’s on it, we’ll submit it right away!”

The three of them were happily chatting away, saying whatever they pleased, and my head was starting to hurt.

For starters, none of us were old enough to get married yet, were we?

And more importantly, was it really okay to decide to get married for a reason like that?

There were so many things I wanted to point out, but I knew it would be exhausting, so I kept my mouth shut.

“Looks like we’ve gotten along nicely with Mio-chan. Anyway, shall we move on to the main event and start studying?”

“Oh, you actually remembered why you came here.”

“Of course! That’s what Riona and I came here for today.”

For the time being, we moved to my room, and I invited the two of them inside.

It felt incredibly strange having girls in the room I was so used to seeing every day.

“…This is the first time I’ve ever had girls over in my room, so I’m a little nervous.”

“Oh, really? Then that means we got to be your first again, Ryoya-kun!”

“I’m going to make sure every one of Ryoya’s first experiences belongs to Big Sis and me.”

I couldn’t help wondering whether there was really any value in taking away the first experiences of someone as unremarkable as me.

While I was thinking about that, Riona took something out of her backpack.

“I want to check your current academic level, so I’d like you to solve this. It’s a practice test I made myself, with questions from all five major subjects covering what we’ve studied since the start of our second year.”

“Huh?! Why do you already have something like that prepared?!”

We’d only decided to study together after school today, and we’d come straight to my house afterward. There was no way she’d had enough time to prepare something like this.

“I originally made it for a classmate who struggles with studying. I just happened to have it with me.”

“Oh, I see. That makes sense.”

“Since Riona ranks first in our grade, people are always asking her to help them study.”

“Anyway, try to finish this within one hour.”

“Got it.”