[Hemisphere]

夜姫と亡国の六姫士 is more along the lines of ガブリエラ戦記 (Gabriella Senki), which involves an all-female protagonist cast.

I don't quite see how having harem/fanservice is fundamental to war strategy genre when the latter can stand on its own well enough.

EDIT: I doubt my initial post made it clear, so I should elaborate.

MF Bunko J is popular for their series with abundant harem and fanservice. On the flipside, Famitsu Bunko doesn't subscribe to those genres as often as MF Bunko J does. Hence the reason why I won't be losing any sleep nor would be bothered with the lack of harem/fanservice in 夜姫と亡国の六姫士, because it's a Famitsu Bunko title (and because I'm looking for the next Gabriella Senki). That, and the author is great at doing his job of writing intriguing stories without resorting to harem or fanservice tropes.