I Promised to Make the Class Honor Student My 'Little Sister'. It Seems She Wants to Be Spoiled a Lot - Volume 1 Chapter 10.1

The Admiration Between “Little Sister” and “Sister,” Stirring Up Chaos

────The “Family Contract.”

It was created by Yukari for Ao and Kizuna-chan, who had lost their parents, with the aim of forming a “family” tied not by blood but by mutual feelings—a gentle contract.

Having left home due to discord with my parents… I was drawn to such a gentle “family” testament and took advantage of Ao and Yukari’s kindness to sign the “Family Contract.”

And now, having always put it off, I’ve also signed a “Family Contract” with Kizuna-chan.

Our “family” relationship among the four of us has become like this:

For Ryuuki… Kizuna is the “sister,” Yukari the “twin,” and Ao the “little sister.”

For Ao… Yukari is the “sister,” Ryuuki the “brother,” and Kizuna the “little sister.”

For Kizuna… Yukari is the “eldest sister,” Ao the “older sister,” and Ryuuki the “younger brother.”

For Yukari… Ryuuki is the “twin,” Ao the “older sister,” and Kizuna the “younger sister.”

…Doesn’t that contradict?!

First off, Kizuna-chan is Ao’s actual sister.

But… if Kizuna-chan is my “sister,” then Ao, who is my “little sister,” should also be a “little sister” to Kizuna-chan.

Also, if Yukari and I are “twins,” then for Kizuna-chan, I should be a “brother,” not a “younger brother,” and the definition of “twins” is bugged.

──Anyway.

Due to Kizuna-chan defining our “relationship” as “siblings,”

This “Family Contract” has… created an incredible twist.

“So, that’s why. Let’s correct the ‘relationship,’ Kizuna-chan.”

Explaining these inconsistencies, I called for Kizuna-chan to make corrections.

Kizuna-chan, listening to my words and nodding, said─

“No.”

A flat-out refusal.

“I want a ‘little brother.’ I already have Ao-neechan and Yuka-neechan above me… I don’t need a ‘brother.'”

“I don’t need… even if you say so. What do we do then? It’s a huge contradiction, you know?”

“It’s fine, isn’t it? It’s our rule only within our house. The minor details don’t matter! …That’s the spirit.”

Without changing her expression much, Kizuna-chan said that and─flashed a grin, flicking up her ash-gray hair.

“Come on, ‘little brother’! Swear your loyalty to me!”

“Hold on! Siblings aren’t about a master-servant relationship, okay!?”

“…Isn’t it? Manga sisters always get away with being tyrannical to their little brothers, right?”

You’re reading the wrong kind of manga, kid.

Holding my head, I asked Kizuna-chan,

“Even if we put the contradictions aside for the moment… why do you want to be a ‘sister’ so badly? And to go as far as signing a ‘Family Contract’ with someone you barely know?”

I’ve been twisting logic here and there since earlier.

Essentially, it’s because─Kizuna-chan has a desire to be a “sister,” right?

As someone living in the Kakogawa household… I don’t plan to refuse unless it’s something truly abnormal.

So, if you have something on your mind─I’d like you to tell me first.

“…I want to be like Ao-neechan.”

──Huh?

Haven’t I heard this line before?

Puzzled, I listened as Kizuna-chan began her explanation.

“Ao-neechan was super cute even when she was little, right? Her fluffy aura, gentle smile, isn’t it amazing? A natural beauty! And then, that kind personality? She’s everyone’s dream wife! I just love Ao-neechan!”

Her eyes sparkling, Kizuna-chan spoke rapidly, sounding just like─a sister-obsessed little sister.

…And, indeed, you sisters really resemble each other, don’t you?

“…Back when it was just Ao-neechan, Dad, and me living together, Ao-neechan did a lot like cooking and laundry. I was little and kinda clumsy… I got a lot of help from Ao-neechan. Reliable, kind, and always there for you─she’s my idol. That’s Ao-neechan.”

Kizuna-chan, having observed Ao more closely than anyone else, spoke with warmth in her words.

──And Kizuna-chan.

With a click of a wink, she said─

“So… I’m going to be a ‘sister’ like Ao-neechan. Competent, able to handle anything smoothly─a proper lady. That’s why, Ryuuki, you’re the ‘little brother.’ By taking care of my ‘little brother,’ I’ll hone my skills and become like Ao-neechan!”

…Well.

The logic is exactly the same as when Ao said she wanted to become a sister like Kizuna-chan and acted spoiled─but somehow, it doesn’t quite sit right.

“No… I get what Kizuna-chan wants to be, but if you need someone to practice your skills on, couldn’t you ask a boyfriend or a male friend? No need to rely on someone you barely know like me…”

“What’s that? You think I have a boyfriend?”

“Don’t you?”

“Of course not. And I don’t have any male friends close enough for that. Guys are… you never know what they’ll do. Scary.”

Saying so, Kizuna-chan looked down.

I see… despite her bold appearance in makeup and fashion, she’s genuinely simple and cares deeply about her “family.”

…Truly a kind soul.

“So… since Ao-neechan really trusts Ryuuki-senpai, and you seem harmless, I’m counting on you… for our ‘sibling’ relationship.”

…And so.

Kizuna-chan and I officially became “siblings.”

▲　◇　▼　◆

“Ryu-chan”

“What’s up, big sis?”

“Fufufufufu… Just calling you.”

What an annoying big sis. And that laugh’s way too creepy.

─So, when it’s just the two of us, it’s “Ryu-chan” “big sis,” and otherwise, it stays “Takato-senpai” “Kizuna-chan”… that’s how we decided to call each other.

Kizuna-chan and I then moved to the dining kitchen on the first floor.

“By the way… let’s keep it a secret from Ao-neechan and Yuka-neechan that I’m doing ‘big sister’ training. If they return, we’re stopping immediately.”

“…Why keep it a secret?”

“If they knew I was training to be a ‘big sister,’… Ao-neechan would worry. She might feel sorry she hadn’t noticed sooner. That kind of thing… just feels wrong, you know?”

Saying that, Kizuna-chan looked a bit distant.

Well… if that’s what Kizuna-chan thinks, I won’t insist on making it public.

“Why not tell Yukari?”

“She’d totally tease me. Annoying, so no.”

Makes sense. That’s a perfectly valid reason.

And with that, we clarified the “sibling” rules─Kizuna-chan stood in the kitchen with a mischievous smile.

“Alright, let’s start… with cooking. Ryu-chan, wash your neck and wait, okay?”

“Why do I have to wash my neck to wait for meals?”

“Don’t talk back. So, let’s go!”

With a louder voice than usual, Kizuna-chan─raised the knife!

A disconcerting sound echoed off the cutting board.

“Owww… my hand’s numb. What’s with this knife? It’s terrible.”

“The terrible one is big sis… normally, you don’t put that much force.”

“Then, like this?”

Tap.

The knife gently touched the vegetable.

“It’s not cutting. Liar.”

“…You’ve really never cooked before, have you my dearest sister. No, is this even a deeper issue…?”

Just a while ago, I thought Ao and Kizuna-chan were quite similar… I take that back.

When it comes to household skills, these two─couldn’t be more different.

“…Let’s leave cooking for another time. Next, I’ll vacuum.”

Quickly giving up, Kizuna-chan this time─brought out the vacuum cleaner.

Well, cooking is quite difficult… maybe starting with cleaning or something is better for acquiring “big sister” skills.

And Kizuna-chan─pressed the vacuum cleaner’s switch.

“Huh? It’s not moving… Seriously annoying. Is it broken?”

Click, click, she flipped the switch on and off.

But the vacuum cleaner remained silent.

Of course… it’s not plugged in.

“It’s really broken. Guess I’ll throw it away.”

“Don’t throw it away, it’s not broken! If you throw it away for such a dumb reason, you’ll be haunted by the vacuum cleaner!”

“Huh? Hey Ryu-chan… are you okay calling your big sis dumb?”

I blurted out without thinking, and somehow, I triggered Kizuna-chan’s switch.

And Kizuna-chan approached me─and grabbed my pants.

“Whoa!? What are you doing!?”

“Eh? If the ‘little brother’ causes trouble, don’t you spank him? I saw it in manga.”

“What era’s manga is that!! Nowadays, corporal punishment is forbidden─hey, stop it!? Don’t pull down my pants!”

“…Ah? What are you two doing…?”

At possibly the worst timing imaginable.

Ao, who had just returned from shopping, witnessed the hellish scene of Kizuna-chan trying to pull down my pants.

Shopping bags dropped from Ao’s hands with a thud.

“I… I was just starting to feel happy that Kizuna was finally warming up to Ryu-kun… To think it was such an indecent way of getting close…!!”

“…Wait, Ao-neechan.”

In a situation that couldn’t possibly be more hopeless.

Kizuna-chan let go of my pants and, for some reason confidently, faced Ao.

Then─she covered her face with both hands.

“Ao-neechan… I didn’t want to do this either…”

“Eh, scary!? Truly, the scariest thing is a woman’s tears, huh!? This isn’t right, is it!? This is how false accusations are born──”