Miya, an illegitimate child, has been living with the main Kounokura family since her mother unexpectedly passed away. With her stepmother and two stepsisters at her side, Miya experiences her fair share of firsts: visiting a department store, watching over the house alone, and even hosting a special guest! There are still many things about this new life Miya doesn't understand... but luckily, her not-at-all wicked stepfamily is there to show her the ropes!