Long lost sister

We all know the story of how the Sage of Six Paths created the tailed beast and how the tailed beast were called monsters because they didn't want be under human control. Well what we don't know is that the tailed beast had a younger sister who they all loved and wanted to protect so before any of them were put into human bodies they created a seal that would contain their younger sister and keep her safe.
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Enter the life of kiko who will go through many challenges and fate is not going to go easy on her.