Akizuki Kasumi from Tamayura ~Mitamaokuri no Uta~, a visual novel by AKABEiSOFT2
I only know this VN exists because the opening showed up a couple times in my recommended. It's only recently that I started listening to it more frequently.
Also, I added "Mitamaokuri no Uta" in the title to not mistake it for another series also named Tamayura
Description
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Normal - akizukitamayura, grey hair, very long hair, asymmetrical bangs, hairclip, blue eyes, white shirt, turtleneck, short sleeves, arm warmers, cable knit, red plaid jacket, jacket around waist, black shorts, white kneehighs, black boots,
Uniform - akizukitamayura, grey hair, very long hair, asymmetrical bangs, hairclip, blue eyes, white capelet, orange neckerchief, collared shirt, dark blue shirt, long sleeves, juliet sleeves, white pleated skirt, black pantyhose, brown loafers