Are there any anime like Allison & Lillia?

I figured I try asking on here for once since so many other people do. It's been awhile since I've seen Allison & Lillia, although I do remember it fully (and it was a great anime in my opinion). Problem is I can't find any anime even close to being as good as I found that one to be. So does anyone know of an anime that has the elements it had: Espionage, Adventure, Romance, etc.?