Ibitte Konai Gibo to Gishi EP1 - My Stepmother and Stepsisters Aren't Wicked

Miya Nakamura lived a humble but happy life with her beloved mother. But when her mother passes away, Miya is taken in by the prestigious Kounokura family. Expecting rejection as the child of a mistress, Miya prepares for the worst. Instead, she's welcomed with open arms by her caring stepsisters, who pamper her with affection and even transform her father's study into a room of her own.