 If you liked
Witchblade
|
 ...then you might like
Tatakau Shisho: The Book of Bantorra
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I would describe both shows as seinen battle shounens, as both shows involve fighting with superpowers and such, but they have a mostly adult cast and have a mature vibe to them.
Also both shows have a strong female protagonist.
Though Witchblade is more of a silly slice of life, while Armed Librarians is a more serious mystery show, so their focus is quite different, but still.