This is a character from Break Age OVA, based on manga series by Zhiemay Batow. The manga itself ran for 10 volumes and you may think there's more materials there than one episode of OVA but honestly the art style is kinda generic in my opinion. Not that the OVA is any better, but I'll take one that is more consistent and more importantly in color. From that single OVA alone Sairi wore 3 different outfits and I trained all of them. The school uniform is not terribly accurate but should work.

Trigger words and basic look:

sairi_break_age, green hair, brown eyes

Outfit 1:

white jacket, black choker, pink top, white skirt, sneakers

Outfit 2:

black turtleneck halter top, red dress, yellow belt, hand bag

Outfit 3:

school uniform, white shirt, red vest, red skirt, blue ribbon,

Optional (best fit outfit 1):

helmet

Style:

traditional media, retro manga style,