OK I remember reading this manga years ago and now I want to give it another read ( I think it's been made into an anime as well). It's about a girl, she looks young for her age, and she has a scar on her chest/stomach and she she has a relationship with a guy that's a lot taller than her. If I'm remembering correctly she can transform into some kind of aircraft and is sent to warzones and the whole story is about her trying to hide this fact. As I've said I'm not entirely sure about this since it was ages ago but it has been stuck in my head for about a month and Google's not helping. Thanks in advance.

Saikano I read this a long time ago, and not sure on all the details, but I think this is what you're looking for.

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Saishuu Heiki Kanojo

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Demonblaze0's personal thoughts

Holy crap thanks to both of you!!! That's the one! It was killing me! Thanks again!