“Health checkup?”


It was Wednesday, the day after the study session.

Aoi chan came to my room with medical equipment that looked like something you would see in a hospital.

Apparently, she wanted to do a medical checkup on me.

“Ah, that’s why you’re wearing a nurse’s costume today.”

“Yes. I’m a little embarrassed that my skirt is a little too short.”

Aoi chan is now wearing a nurse’s costume.

Moreover, it’s not a normal nurse, it’s a dental nurse uniform.

As she says, the length of the skirt is very short, and it is quite a challenging outfit.

Although the fabric area is bigger than the previous bunny suit, I think it is more extreme because Aoi chan is blushing.

I tried not to stare at Aoi chan as much as possible and continued our conversation.

“It has been a week since Onii san came to our house.”

“Don’t you mean you kidnapped me.”

“Don’t worry about the details. I just need to make sure that you are not unaccustomed to the change of environment and that you are not getting sick.”

“Well, if that’s what you mean. But how would you know if there was something wrong?”

“I may look like this, but I’m a licensed physician.”

“A middle school student has a medical license……?”f

I don’t know what you are talking about.

When I was confused, Aoi chan took out a stethoscope from her bag and applied it to my chest and back.

Other than that, my mouth was shoved with something like an ice cream stick, and I was given a full-fledged doctor-like treatment.

“…..It doesn’t seem to be a problem.”

“Really? Then that’s good.”

I don’t know if it’s healthy to be kept in confinement, though.

“……I got some good data.”

“Hmm? What did you say?”

“No, nothing. Moreover.”

Aoi chan started to put away the medical equipment in her bag.

At that moment, something fell out of Aoi chan’s bag.

It seemed to be a glass bottle that cracked when it fell to the floor.

A reddish-purple liquid was pouring out from inside.

It was probably some kind of chemical.

“Aoi chan, did something fall on the floor?”

“Eh? Ah, O-Onii san ! ! Cover your nose and mouth ! !”

“Eh? What……hm……? Suddenly my vision……”

Suddenly I felt dizzy and I fell into bed unsteadily.

“Onii san ! ! Onii san ! !”


I want to sleep. I feel sick. My head is dizzy.

I feel sick all at once and sink my consciousness into the depths of darkness.

However, consciousness soon emerged.

“Nn……hm? What happened……?”

“Onii san……?”

“Aoi chan? Eh, what’s wrong? You’re staring at me like that. Hm? Aoi chan, did you suddenly get bigger?”

“Uh, well, you see, this is……”

Oh, I’m not talking about breasts.

Somehow, Aoi chan is taller than me.

It’s kind of like my body has become smaller…..

“……Onii san, please don’t be surprised.”

Saying that, Aoi chan took out a hand mirror.

I casually pick up the hand mirror and see myself reflected in it.

“…..Eh? Is this me? I-I mean, don’t I look smaller?”

My reflection in the mirror was younger.

I think my age is less than ten years old. I wonder if it’s about the lower grades of elementary school.

W-what’s going on here !?

“Yes. Onii san inhaled the rejuvenating potion I was developing and became a child.”

“Wha !?”

I had become…..a child……! !

“Eh? I-I’m going to be fine, right? This will go back to normal, right !?”

“Just in case, maybe, just maybe.”

“I’m so nervous ! !”

“Well, it’s an unfinished product that is still under development…… It is certain that you will return. But I don’t know when. Tomorrow or the day after tomorrow? Next week or next month.”

“Y-you don’t have an antidote or something?”

“There is no antidote.”

N-no way, seriously……

“Well, I’ll just have to make one.”

“Eh? An antidote !?”

“I don’t have it, so I’m going to make it. Right, I think it would take me a week to make it.”

“P-please ! !”

Thank goodness.

I’m glad that I didn’t have to start over from a child again, like a manga or anime from a long time ago.

……No, it might be quite a fantasy when you become a child.

“……By the way, Onii san.”

“Hm? What’s wrong?”

“Can I give you a hug?”

Aoi chan said with her eyes shining as usual.

“Aoi chan, you have no remorse. I mean, why were you carrying around unfinished medicines?”

“I always carry unfinished products with me to avoid theft. Also, I’m sorry for what I did. Let me give you a hug for that.”

With a sparkle in her eye, Aoi chan says she is sorry without showing any remorse at all.

“I don’t think I can stand it any longer, Onii san.”

“Whoa !? Wait, Aoi chan !?”

“……It’s Aoi Onee chan.”


“Now, please call me Aoi Onee chan.”

This girl is enjoying the situation right now ! !

But Aoi chan doesn’t intend to stop hugging me until I say that.

Ugh. I’m embarrassed, but I have no choice but to do so.

“A-Aoi Onee chan?”

“What is it, Onii san? Do you want me to pat your head?”

“Whoa, wait ! !”

“I always wanted a younger brother. From today on, you are my little brother.”

I knew you weren’t sorry ! !

“……I was only going to have a physical examination today, but I’ve changed my plans.”


“Onii san, from now on this sister will sleep with you.”

“Huh !?”

Aoi chan who dives into the bed while hugging me.

T-the distance is extremely close ! !

“I-it’s still daytime…….”

“Children need naps. It is said that a child who sleeps grows up. So, let’s go sleep with your sister, Onii san.”

“No, I’m not a child though !?”

Aoi chan gently pats my resisting belly and tucks me in.

O-oh…… What, I suddenly feel sleepy……

“I’ll sing you a lullaby too.”

“Ah, wait, you can’t talk in my ear…….”


A lullaby is sung in a whisper while the belly is patted.

The particular sweet smell of Aoi chan’s scent made me feel sleepy again.

Oh no, I’m already feeling sleepy……

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