Strike Witches
A seventh manga titled "Strike Witches: Aurora no Majo" (ストライクウィッチーズ オーロラの魔女) was serialized in Nyantype magazine from September 2013 to October 2014, and follows the story of the Suomus LLV24, including telling the stories of Eila Juutilainen and Nikka Katajainen's past, characters who feature in the Strike Witches and Brave Witches anime respectively.