ReThree: sisterhood

"Learning from mistakes was never my way. This story I want to tell you is the price of my ambition. When my sister lost her life because of my errors, for the first time, I felt regret.
'If I had lived a normal life, this wouldn't have happened.'
For the first time, I prayed. I, the proud Azima who relied on nothing and no one, now prayed to something I didn't believe in.
'... God, please give me another chance...'
To my surprise, that which I didn't even know its identity granted my wish. My sister and I were reborn in a world entirely different from the one we had lived in before.
'I will take care of you this time, Arina.'
But everything didn’t go as I wanted.
'I want to be a knight.'
'Wh_what?'
Now that I wanted to lead a peaceful life, it's Arina who wants to get herself into trouble. And not just any world, but a world full of monsters and magic.
'Can I create a good ending for Arina this time?'