1: From the Taishō period to this modern day, who are you?

Y/n is a university student, who is struggling to keep up with her studies and feels like there is nothing to life besides her degree.
One day, someone hands her an ancient diary that was found.
It had her name, and her story, from what was assumed to be the Taishō period.
She had a similar backstory, but only with one difference.
She had a lover, who she recognized as one of her close friends.