I Raised My Younger Sister Beautifully

Summary

The imperial family collapsed in one night. By Basilisk, the summoner of darkness; summoned by Fletta, the Cursed Princess. “If there is a next life… Can I really be your sister?” Would it have been different if I had approached you a little more? It was the last time everyone regretted it, and like a miracle, time returned to six years ago. If this is the second chance given to us… ‘Yes, I’ll heal you. To prevent the awakening of the Basilisk’s darkness.’ So I decided. “I look forward to your kind cooperation, Grand Duke Darian. No, Kylia.” I decided to marry Fletta’s maternal uncle, Grand Duke Kylia. I thought there would be no problem because it was a one-year contract marriage. “Honey, ah, try it.” “You have no idea how much I like you.” “I will continue to like you. I want to express my affection to my heart’s content… Can’t I?” What’s wrong with this guy? When I try to save Fletta, the Grand Duke comes along with me (?) Aren’t you the Monster Grand Duke…?