Wow, it took me a while to figure out this character's name. She's 鴛時ミライ from some ANOS novel series called そう、あたしたちはこんなにも理不尽な世界に生きているのだらよ (Sou, atashitachi ha konna ni mo rifujin na sekai ni ikiteru no dara yo), and I'm not sure I want to create a tag that long.