Konse dewa, Futago no Ane no Kage to Shite wa Ikimasen

Only on the verge of death did I realize I'd been deceived my entire life by my perfect twin sister. Shocked by the betrayal, I wished I could just close my eyes... but when I opened my eyes, I was back in my childhood!? I had to pretend to be a princess with my sister without letting her know I was a twin! Now that I'm back, I won't just be exploited by my sister like I did in my past life. The relationship with my family I'd longed for, the friendships I had with my friends, and the healing power I hadn't realized in my past life. I'm going to make them all mine! Then, by chance, I meet the talking bird, Yan. He tells me that if I don't protect him, the kingdom will fall. What does that mean? Will I be able to survive?...