How could your brother decide to execute you! just because you're a different from him?!. pick another girl and said that it's her little sister when the reality it's you! The original one

You're being reborn as "Rebirth" after being killed by your big bro.the one who watches world changing in your "Realm of Forgotten". Wandering your places in the cold winter realm with your other beast siblings.

But,you never know that someone accidentally visiting your own realm without a permission.