Nope, instead, this OVA is actually a bonus episode of Strike Witches disguising itself with the Brave Witches title, featuring Eila and Sanya, the popular pairing from the original Strike Witches anime. The rest of the "main cast" take a backseat this episode.
Technically this episode takes place between roughly around episodes 7 and 8, but I don't think it would work watching it in chronological order, because this standalone episode disrupts the flow of Brave Witches' primary story.
While I am a fan of the various spinoff media of the World Witches franchise, I am admittedly not a Sanya x Eila fan, or a Strike Witches fan for that matter, given my own criticisms of the original anime.
As such, I had my expectations crushed when I found out this more for older Strike Witches fans. Regardless, I did enjoy seeing Hikari fantasizing about Takami in a romantic way, as has been hinted on her borderline idolization of her sister in the main story, though seeing Eila get jealous of Sanya's many admirers does get old.
However, someone who hasn't viewed Strike Witches before can still successfully watch this bonus episode and see it as characterization for Sanya and Eila, who in Brave Witches, are supporting characters that only cameo a couple of times, and from there go to watch the original series that they're main characters in. So it's a win-win situation for new Witches fans and business wise.
