“I killed my sister. Now I will live as her.” Mischevious Nobara and good-girl Kotori are identical twin sisters. After their father’s death, they lived with their grandmother and mother, respectively, but one day, while they had switched places, Kotori was murdered! Because she was robbed of her most precious daughter, Nobara’s mother’s hair turned pure white! Nobara, who is tormented with guilt, decides to live as Kotori in order to protect her mother…!?