I Raised My Younger Sister Beautifully동생을 예쁘게 키웠다; I Raised My Little Sis Beautifully; 妹を可愛く育てたら大公 様に溺愛されました; Я прекрасно воспитала свою сестру

The imperial family collapsed during one night by the basilisk, the summoned beast of darkness which was summoned by the cursed princess, Fleta. If there is a next life, then Can I really be your younger sister? If I had approached you a little earlier, would it have been different from now? The last time everyone regretted it, the time miraculously returned to 6 years ago. If this is the second chance we've been given.