Am I the Villainess of this Story?

First, I died in an unfortunate accident...
Next, I woke up as a baby surrounded by doting parents...
Now, after years of living my new life liesurely, I finally realize why my new name sounds so damn familiar...
And that is because, I, Shirakawa Masaru got reincarnated as Marianne Einhart, a rival character in the fantasy otome game played by my elder sister called "Love At Magic Academy"...

This is a story of a boy who got reincarnated as a female rival character living his new life as he pleases...

First Person POV
Main POV is that of the main character
Other Characters' POV will be pointed out