This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular anime series "THE [email protected] CINDERELLA GIRLS" comes a Nendoroid of Mio Honda wearing her school uniform and hoodie! She comes with three expression parts including her standard cute smiling expression, a playful winking expression as well as a high-spirited smile filled with energy! The backpack she uses as a school bag is also included allowing you to recreate various scenes from the series.