Based on the blurry details in the background, I'd say that's Dobermann back there.

Kroos is in Fang's phone, should she be tagged?

B4TL: I see Iowa has paid Eugen for the Tatami.

b4 translation: Looks like Warspite snitched on Iowa

And Justice for All

Dank.Knight said:

b4 translation: Looks like Warspite snitched on Iowa

snitched so she can play 2 hours a day instead 1 hour.

So Italy is the only winner of this war!? 0 loss and gained 2 more labours.

jindo90 said:

So Italy is the only winner of this war!? 0 loss and gained 2 more labours.

I wonder if Italia from Hetalia would be proud of this?

At first I was thinking that since she's a girl using "boku" she meant that Mahiro was the same but that seems a bit far-fetched. It'll be interesting to see where the artist takes it from here, hopefully it won't turn into some anti-climax next month.

Unbreakable said:

At first I was thinking that since she's a girl using "boku" she meant that Mahiro was the same but that seems a bit far-fetched. It'll be interesting to see where the artist takes it from here, hopefully it won't turn into some anti-climax next month.

She was probably already aware of Mahiro and the truth about her at the beginning (of the chapter).

Some scenarios I see as plausible:
1: Mihari in disguise. (Unlikely, though it does tie in with her "watch out for suspicious people (strangers)" at the beginning of the chapter)
2: Someone like Mahiro who was changed by Mihari's drug. (Also ties in with Mihari's line)
3: She may be transgender.
4: She may fancy herself a detective.

Now, of those explanations, I think two and three are most likely.
Evidence for those:
Nayuta: While enamedict does include a number of ways of writing as female given names, I get a strong "male name" sense from the name.
Her use of ぼく -- specifically in hiragana (I tend to associate, whether true or not, use of "boku" by female characters with the word being written in katakana)
She also seems to be... well, excessively formal. Coupled with her uses of のです (which seems a bit more... adult than I would expect given her apparent age -- not impossible, but....)

Scenario 2 and 3 were also stuff that popped up in my mind and I wouldn't be too surprised if they turn out to be true.

Pretty sure templates like that are forbidden.

Emerald_Acid said:

Pretty sure templates like that are forbidden.

Templates like what?

さくら said:
-snip-

You can be dressed up as the other gender without being transgender. Otherwise majority of British actors would have to be considered transgender.

The trope of a guy dressing up as a girl and pretending to be one without wanting to be one isn't a new one either.

Also, if she/he/whatever is the same age as the rest of them, then going through the sex change procedures would be kind of cruel thing to subject a child to. There's a reason why lot of people that are considered transgender don't go through the procedure as of yet. They are waiting for technology to catch up and not risk horrible failures and gender dysphoria (which leads to immense depression and extremely high suicide rates)

Tbf, I do think you might still be right about them being transgender --> someone that is dressing up as a girl and desires to become one. I don't think it is likely, but it is undeniable plausibility at the very least. They could be desiring the invention of the sister to use for themselves.

Honestly, personally I think they are simply very discerning girl that is good at reading people and doing their research. Suddenly that sister, a proper scientific genius, who had a big brother NEET, gets a sister out of the blue, at the same time the brother disappears to uni, someone that has been effectively going full kikimori for a good while?

Basic research would be enough to find all of this out if we are going to be perfectly fair. Of course, then deducing that the "new" sister is actually the brother transformed into a girl is a pretty big leap, but she may simply want to eliminate that unlikely idea by testing the "sister" by calling her a brother. Depending on how she would react would either reinforce or eliminate that unlikely possibility.

Quote:
"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."