 If you liked
Koukaku Kidoutai
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 ...then you might like
Tenshi no Tamago
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Mamoru Oshii Films
Female protagonist (Main character)
Philological subjects and tones
" At the end the main character also "goes into" its reflection and becomes a new, more mature being."-some person on reddit.
Both of these animes are intellectual and meant to be interpreted their own way, they leave much questions left after the show has ended and are not that great in the plot but much more interesting in the message behind.
I am sure that anyone who appreciates one of these movies will appreciate the other one.