Reversing the World Line Alone, Just Because He Was Rejected by His Sister

Single heroine This is a world of magic... It doesn't matter even if you don't have magic power, because of me, Not only is there no magic power, No family yet, I originally just wanted to live a stable life with my sister. Until the door of the house was kicked open by a strange girl. "How long will you continue to be a coward? I can't stay with you for the rest of my life." ……… "Brother, I am leaving you forever. You must live well." ……… "For the 321st time, my brother finally walked out of the town." ……… "For the 322nd time, I became a 'Fallen Angel'." "From beginning to end, it's only me." I am a high-level magician and a member of the Adventurers Association But I'm at someone else's door now, Consider whether or not to kick open this door. What a mystery all this is... Only in this way can the "destiny" of everyone be involved. It all starts with my good-for-nothing Ernie...