いのち (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: It was Atashi who killed my sister. That's why I'm going to live as my sister. Twin sisters "Kotori" and "Nobara" have identical faces. Since the accidental death of their father, they have lived separately with their mother and grandmother!　In order to heal the guilt of proposing the swap and the grief of her mother, "Nobara" decided to live as "Kotori", but ......!?

(Translator: DeepL)