Quote from AA-A-AA

Not sure how helpful it would be since it's been years, but aside from what you wrote above, is there anything else you remember?

For example, was the art style very old or more modern?
If you have an idea, it would be helpful at least when it comes to eliminating some of the choices, like olde ...

I'm still looking for this one. Thanks for the tips but I didn't find it (I'm "a bit" late for the reply, sorry).

Another year. Another bump. It was all a dream...

Do you remember if it was a male lead? Or was the focus more on the sister?

Do you remember any of the genres? Also was it european ambient?

You may also want to try these:
Siblings
War/s

Well. It was the start of the story, and the focus was on the male lead on that part. It was in an european ambient, but as I don't remember the "civil" part of the manga world I can only talk about the military part. I will search more using those tagas, but I think that I already did. Thanks for the reply.