Strike Witches: Erica Hartmann 1941 (ストライクウィッチーズ エーリカ・ハルトマン 1941, Sutoraiku Witchīzu: Ērika Harutoman 1941) Illustrated by Tsuchii. The manga is a prequel story for Erica Hartmann, following her early days in the Karlsland JG52, three years before the start of the Strike Witches anime. More @Wikipedia
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