Prologue

[Marriage]

It is a man and a woman becoming husband and wife.

Although there is a fixed age at which they become eligible to marry, they are free to marry whomever they choose.

—- except for just one example.

Marriage between two blood-related Siblings.

“Let’s get married when we grow up.”

When you were a child, did you ever make a promise of marriage to a Sibling?　

A child’s silly, adorable promises.

But as they grow up, they learn that siblings cannot marry each other and eventually forget about it.

There is no such thing as growing up with your feelings as they are.

Because you can’t get married.

It may be a heavier love than adultery or two-timing.

It may be more forbidden love than teacher-student.

A love that cannot be fulfilled. A secret love, even if you had it.

That is what it means to love a blood siblings

But what if you could get married?

This is a story of our love and regrets…

◆◇

My older sister and younger sister hate me.

That would not be paranoia, it would be fact.

At the dining room table sit two people who look very similar, but have very different hair colors and styles. They are an older sister and a younger sister.

“…..”

“….”

Arika, the older sister, was wearing no glasses or reading a book, while Sumika, the younger sister, was fiddling with her phone.

I was playing a smartphone game on the sofa away from the table.

Although this has been going on for an hour, there is nothing to talk about.

Today is a holiday, but there is no talk of going out anywhere. No, not just today, but for the past year, the three of us have never gone out together.

Well, I’d like to get out of the living room soon, but I don’t have time to stay cooped up in my room at ……, so let’s try to kill some time outside.

I had my cell phone and wallet and was about to leave the living room.

“Hey, Towa”

I got up from the sofa and my older sister spoke to me.

“Hnn, what is it?”

“Going out”

“Yes….”

“If so, I’m out of ice cream, so go get me some.”

“O-Okay…”

“Ah, Sumi wants chocolate.”

“O-Ou….”

The conversation ends here.

The tone of their voice and their attitude are still somewhat cold.

…… I guess they don’t like me after all.

Even though I know they don’t like me, it’s sad again when they say it out loud or show their attitude.

Recently, I have become accustomed to them and can understand what they are saying just by saying “um” or “yeah.

“Don’t just stand there. Come on.”

“That’s right. It’s just going to be extra plain~”

“…I’m going”

I Leave the house and stop.

Sunday afternoon. I sigh again today.

“Haaa, when did it get so cold ……?”

On a weekday morning, with birds chirping and sunlight streaming in through the window, I wake up to the weight of my arms.

After making breakfast and lunch, I left the house ahead of the others. As I was walking to school, someone patted me on the back and gave me a big smile.

“Towa! Good morning!♪”

It’s Naruse Runa, a childhood friend who lives next door to me and has been with me since kindergarten.

Today, her trademark navy blue side tails are still waving in the air.

A jawline, a small smile that mangled me. She smells a little sweet, but not too sweet, but rather elegant. She is a little taller than average for a woman.

“Good morning, Naruse.”

“Mouu, We’ve known each other since we were kids, so we should call each other names, right?”

“I don’t know which of yours is the last name and the first name.”

“Let’s introduce ourselves, shall we? I’m Naruse Runa! I’m your childhood friend and we’re in the same class at the same school!”

She is still the same easy-going person.

Such an appearance of Runa cheers me up.

“Fuaa….”

“Oh, dear? Are you still sleepy?”

I feel most happy and relaxed when I am with Runa. If I said this to her, she would make fun of me.

“So, what about over there?”

“…… as usual.”

Runa asked me about my older sister and younger sister.

I only told Runa that the two of them are cold towards me.

“Hmm~”

Every time someone asks me about it, I get an uninterested reaction. Well, others are not interested in other family affairs.

“You can count on me if you need anything, okay?”

“I’ve had to rely on you enough already.”

“No, no, no. You can count on me every day.”

She is a really nice guy. If we had not been childhood friends, I would not have been able to get along with Runa, and moreover, I would have been out of the mosquito net.

“…… fufu, I’m the only one Towa can count on, aren’t I?”

She seemed to have mumbled something in an inaudible whisper, but I didn’t notice.