Rena Yang Age 25

I was going to work at the library like usual. I was walking down side walk. On my right was two teenage boys with head phones on. The one on his left with the blond hair was his brother Steven. They were my neighbors and the one on the right of him was his brown haired brother Troy.

It was morning we were heading near each other. Their school was next door to the library I work at. I wasn't really paying attention to their clothes  though since I was heading out to the library.

Steven: Hey the old lady next door heading out too, Steven 

I hate how they don't even bother to remember my name. 

Rena: I'm heading to the library and I'm not old.

I didn't want to hear Troy's annoying complaints either so I ran off making my long black hair fly in the wind. I kept running until I was out of breath and at the library. Once I stepped into the library I felt a weird invisible force broke through. (kinda like a barrier is she means) 

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Rena ??? age 10

Something was strange since my body looked 10 years old. I was inside a library larger than the library I had walked into. It was about 200 meters wide and there were shelves of books reaching the roof. 

Rena: Wait why am I in my 10 year old form.

I don't know what's going on but I'll go sit down with a book.

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Short version: she went to work because she's a librarian. But got annoyed by the boys next door so she ran off ahead of them. Once inside she felt like a rift opened up and she finds herself in her 10 year old self.