Hogwarts: A little lion in the skin of the Eagle School

[Single female lead Hermione + no system + primarily based on the movies with supplementary reading of the original books + storyline starting from the third year + slice-of-life]
My name is John Merrick. In my previous life, I faced off against the Hundred-Ton King to save people, and ended up being transported to late 20th-century England.
Because I didn't have a system to rely on, I thought this was just an ordinary world.
But when I was 10 years old, I saw a car fly across the sky, and then two people who claimed to be from the Ministry of Magic came to my door. Just like that, a fantastic magical world opened its doors to me.
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Harry: The sky has fallen, folks! The Ravenclaws have actually gained the approval of the Gryffindor sword?
Hermione: I never imagined there were people even more reckless than Harry and Ron...
Ron: I don't know, but as soon as he came, Hermione stopped playing with me.