Serena from Violated Princess, a game by 思い出し笑い /omoidashiwarai.
I was gonna go on a speech about how I'm confused on why this model in particular is so popular, getting 100+ likes despite the fact that her armor sucks, but then the Illustrious version slaps me with the same issue.
EDIT: Ok, found out how to make her armor close to the original. replace "armored dress" with "plackart" and add "breastplate" to negative prompt,
Description
keywords: serenavpilus, blonde hair, very long hair, twintails, red eyes, hair ornament, short dress, turtleneck, sleeveless, plackart, floating armor, gauntlets, waist cape, thigh boots
add "breastplate" to negative prompt