Nanbaka - I don't have a number but still landed here

I came up with this while watching the first and second season today(06.05.2021), because I don't have better things to do. It's a bit different from what I usually write because it's a xreader story.

Y/N is a girl from Japan, 15 and a half years old. She has a past she can't remember. Only some sentences spoken by herself and another person. It was a promise she only used once.
Now in High School, everyone thinks of her as a boy. You can't visit an all boys school as girl now can you?
She is suddenly imprisoned, but because they find a strange thing in her bloodstream, they decide to contact Naba Prison to take her till inocennce is proven.
So what can she do in a cell with a medicine addicted, a somewhat pervert, a food maniac and a silent person no one knows how to start with?

Welcome to Nanba Prison. Please try not to ...... your annoying inmates.