That school uniform remind me of cg game, aruto if not wrong...
But I don't know the character...
Does anyone know? thanks.

It's Alto, aruto is just the engrish'd way they have to write it. And this is specifically from Miharu Alto Another Story, the extra route/fan disc.

Edit: Well, I was gonna add her name but apparently getchu have removed the original game and only have the alto bundle pack now which doesn't have character names or descriptions in it and purple's site is kinda useless as they don't have a character page. At this point all I can say is thank god for wikipedia :D