Diary of Jane

You are in your university library when you accidently drop a book unto the floor. Bending down to retrieve it you make an unassuming little discovery: a thin black book wedged under the shelf. It is covered in dust and looks like it has been under the shelf for years. It has no bar codes or labels, and upon opening it appears to be a notebook or maybe diary, written in a neat, tight and feminine hand writing. You decide to stuff it in your own backpack to maybe return or even use, little understanding the momentous changes it will soon cause. A body swap, slice of life, just trying something out.