I Raised My Younger Sister Beautifully

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