In a prison so big that it is called a city, all sorts of criminals have been amassed. Due to the inescapable walls, the population only continues to grow. Within are a pair of siblings - a young girl and a recently born boy. What will be their fate in this desolate, cold city…? A story of hope and struggle begins.
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**Official English Volumes:** [Seven Seas](https://sevenseasentertainment.com/series/soloist-in-a-cage/)
