This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
"Nendoroid More" is a series of products created to make Nendoroids even more enjoyable, and the latest addition to the series are these cute Nendoroid face parts cases! The cases allow you to store up to two spare expression parts inside while also having a cute appearance to put on display - which means that even your spare parts will have a place in your collection!
Note: No Nendoroid expression parts are included with this product.