My Stepmother and Stepsisters Aren't Wicked

About

When her beloved mother dies of illness, Miya Nakamura, the illegitimate daughter of a distinguished family, is brought into the Kounokura family's main household. Expecting nothing but scorn and cruelty for being a mistress's child, Miya prepares herself for the worst... Yet what awaits her is something she never could have imagined...!