Mizumiya Nene from Ingoku Jogakuen, a game by developer UnderMoon.
Now in Illustrious, and just cringed at one of the stances where I spelt pantyhose as pantyhouse
Description
keywords: blue hair, long hair, twintails, blunt bangs, purple eyes, white shirt, short sleeves, serafuku, hair ribbon, white ribbon, red bow, purple skirt, school uniform, black pantyhose