My Little Sister Suddenly Confessed to Me, but What Am I Supposed to Do by Dating My Little Sister?

Chapter 1: The Answer to the Confession

A massive event—getting confessed to by my little sister—occurred the day before my high school entrance.

Since it was before enrollment, does that count as the final event of my middle school life……?

Well, the details don’t matter. In any case, my high school life had kicked off with a turbulent start.

But what was I supposed to do?

I was agonizing over it…… getting confessed to by your sister isn’t exactly something you can brag about. If anything, one wrong step and it could turn into lifelong trauma……

I had absolutely no idea how to handle this situation.

My sister had forced a smile through her swollen, tear-stained eyes and asked,

“When can I get…… an answer?”

She was probably terrified of what I might say…… but seeing her try to smile because she didn’t want to show me her crying face was kind of endearing.

Still, even with her asking that, I couldn’t give her a specific time.

“Anytime soon isn’t really a good time with high school starting. Can you wait until things settle down a bit?”

Flustered, I somehow managed to smooth things over for the moment.

She seemed like she wanted to say something else, but maybe she thought she shouldn’t trouble me any further?

“……Okay.”

Saying just that, she wiped her tears and went back to her room.

I collapsed onto my bed, burying my face in the pillow to calm my nerves.

“Why confess to me?”

Along with that mutter, thoughts of my sister swirled endlessly in my head.

Me and Shiori. Since our parents were busy and kind of hands-off, it was always just the two of us. Kindergarten, elementary, middle school—we were always together.

There weren’t any other siblings close in age around us, but I don’t think there was much difference between us and any other pair of siblings who only had each other to rely on.

We weren’t particularly close, but we weren’t on bad terms either. Just normal siblings…… or so it was supposed to be……

I never in a million years dreamed she held romantic feelings for me.

“Impossible. That perfect-at-everything sister fell for me? No, no matter how I look at it, this is a prank, right? Is she teasing me?”

I can only imagine a future where, if I said OK, she’d look at me with a deadpan face and say, “Ew, Onii-chan, you actually took that seriously? Creepy.”

But… when I remember that serious expression, those tears… I can’t think it was a lie.

“I DON’T KNOOOOOW!!”

With my face still buried in the pillow, time passed in agonizing confusion.

The next morning, the day of the entrance ceremony.

“Ughhhhh—did I sleep? Did I not sleep? I can’t even tell……”

My sister confessed to me yesterday, but nothing had particularly changed. It was a morning just like any other.

“Good morning, Onii-chan~! It’s morning, you gotta wake up~! (Smile)”

…Yeah, my sister didn’t wake me up like that certain sister of a former vampire. I woke up to my alarm as usual, put on my brand-new uniform, and went downstairs.

We live in a detached house in the Tokyo suburbs. My salaryman dad pushed himself a bit too hard to buy it a long time ago, so both my parents work.

The second floor has mine and my sister’s bedrooms; my parents’ room is on the first floor.

Downstairs also has the living room and dining kitchen, but well, it’s a small house.

Dad leaves early every day and comes home late. When I walked into the kitchen, he was already gone, leaving only Mom and Shiori.

Shiori was nibbling on toast in front of Mom.

“Mornin’, Onii-hyan.”

Chewing on her bread, she gave me her usual greeting.

“Ah, yeah. Morn—ing…”

I tried to greet her as normally as possible, but I stumbled a bit. Still, I managed to get the words out and sat at the table.

“Sorry your dad and I can’t make it to the ceremony. April is just so busy.”

Mom put her hands together apologetically.

“Parents don’t need to come to a high school entrance ceremony anyway. It’s fine, Mom. Right, Onii-chan?”

“Uh, yeah.”

It’s no use. I can’t get yesterday’s event out of my head…… How can she act so normal?

Was it actually a dream? While I was thinking that……

“Onii-chan, if we don’t leave soon, we’ll be late. I’m done eating, so I’m heading out first.”

Shiori stood up, grabbed her bag, and left the kitchen.

We don’t walk to school together usually anyway. I mean, we went to middle school separately too.

So yesterday’s confession was a joke?

Or was it really a dream?

As I slowly gnawed on my toast, thinking it over…

“Are you okay on time?”

Mom called out to me. I looked at the clock—thirty minutes had passed since Shiori left.

“Whoa! I’m off!”

Toast in mouth, I panicked and dashed out of the house.

I sprinted with bread in my mouth, but alas, no collision with a beautiful girl at the street corner, no birth of a new romance. I just arrived at the entrance ceremony venue.

Our high school has a tiny gym, so they rent a nearby hall for the ceremony.

Since I arrived late, seating was free-for-all and mostly full.

I took an empty seat, caught my breath, and looked around.

I didn’t know where Shiori was. Well, we usually do our own thing anyway.

It was too usual. Yesterday’s events flashed through my mind again.

“Go out with me, Onii-chan.” My sister confessing while shedding tears.

While I was agonizing over that, the ceremony apparently featured a beautiful student council president, a beautiful freshman representative, and the announcement of a young female homeroom teacher—but I missed all of it because I was spaced out.

The ceremony just ended.

I mean, I don’t even know if those people actually existed or not……

Finally, the class assignment sheets were passed around.

I looked for my name, and before I even had to search for my sister’s, I found it right under mine.

“Same class as Shiori……”

Carrying a significant amount of anxiety about my high school life starting tomorrow, I left the venue.

When I got home, Shiori wasn’t back yet.

I went to my room, changed clothes, and went back to agonizing mon-mon style, until—

“I’m hooome!”

—I heard her voice from downstairs.

I hadn’t told her when I’d give her an answer, but I didn’t think I could survive high school starting tomorrow in this state.

But I didn’t know what to say to her.

I thought for a while, but no good ideas or words came to mind.

“Arghhhhhh—okay! Worrying about it won’t change anything!”

If I see her face-to-face, maybe I’ll know what to do.

And if I just say exactly how I feel in that moment, maybe something will get across.

I psyched myself up once and went downstairs.

In the living room, Shiori was sitting on the sofa in her uniform, fiddling with her smartphone.

Pikon. That distinctive notification sound rang out.

LINE with friends? That’s nice, having lots of friends……

I psyched myself up one more time and entered the living room. Shiori looked up, saw me, and smiled brightly.

“Welcome back, Onii-chan! Hey, did you see? The student council president was super beautiful, right? And the freshman rep girl, wasn’t she ultra-cute? Plus our homeroom teacher is totally young and pretty! Oh, and Onii-chan, we’re in the same class! That hasn’t happened since elementary school!”

She spoke cheerfully, happily……

Ehh—! They really existed? The beautiful prez, the cute rep, the young female teacher?

Dammit—

No, no, that doesn’t matter right now…… well, it’s not doesn’t matter, but that’s not what I came here to talk about..

“Shiori, got a sec? About yesterday.”

When I looked at her with a serious gaze and said that, her smiling face distorted in an instant.

“Yeah……”

Seeing her face twist like that made my heart ache, but I had to say it properly……

I sat down in front of my sister, who was looking down, and mustered my courage to ask.

“Were you serious about yesterday?”

“Yeah……”

“I-I see…… Since when?”

“I don’t know……”

She shook her head slightly. Her small body was trembling, and her hand gripping the smartphone was clenched tight.

“When you say you want to go out with me, what kind of way do you mean?”

“……”

“I don’t think I even need to say this, but you know siblings can’t get married, right?”

“……Yeah.”

“I’m going to be honest. I’ve never dated a girl before. I don’t know what dating means, or what you’re supposed to do. Let alone doing it with my own sister.”

Drip, drip. Tears fell onto the hand gripping her phone……

“You’re my precious, precious little sister. So I don’t want to make you cry, and I don’t want to hurt you. So…”

Did she sense she was being rejected? She lifted her head and straightened her back.
Even while tears streamed down her face……

“Let’s date as brother and sister.”

“Huh?”

With tears pouring down her face, my sister opened her big eyes wide and let out a small, strange squeak.