I brought all the necessary forms with me to the
U.S. Consulate General Naha today.
While one of the workers was looking over the documentation, they said that it might not be enough as it lacked my high-school transcripts and a high-school diploma might not be able to prove my existence in the States for that long as there is distance education (though, definitely not in my era and I'm only 32)—my heart sank as I knew it'd be another emergency visit planned out at a later date too.
However, my official copy of my high-school diploma was with my orders to MCRD San Diego package / MEPS paperwork that is about 50 or so pages long. They asked the Consulate officer if anything in that pack would work to prove my residency in the States for my daughter to qualify or I would have had to get my school to send me official transcripts, again.
I don't know what worked—perhaps my work history prior to joining the Marines? But, it worked.
My wife and I affirmed that everything was as accurate as possible and swore to it.
I'm unsure if that makes my daughter a US citizen now or whether she is one after she gets the passport along with a potential Consular Report of Birth Abroad (a birth certificate of sorts from what I can tell) in the mail or until she gets a Social Security number issued from the Social Security Administration section of the Embassy in Mainland Japan. Nonetheless, she's on her way to truly being half/half (instead of by blood only)!
...a little pricier than I wanted to pay as it was $215 and she doesn't necessarily need a U.S. passport which could've reduced the fees... but, whatever it takes, I guess.