The OVA stands for Operation Victory Arrow, and this operation is set in the period between the end of Operation Mars in the second television series and the 2012 Strike Witches movie. The three 30-minute short stories depict the lives of the members who returned to their respective homes. 
 
To commemorate this new Strike Witches project, there will be special event screenings of the shorts in theaters.
 
(Source: Anime News Network)

After discovering that Neuroi are capable of communication with humans and making peace with the nest above Gallia the Witches squads are now on a mission to re-establish communication when a sudden attack vanishes the Neuroi; they now discover a new and massive nest that just appeared covering almost all Europe. Ruthless and without mercy it annihilates allied forces along with Witches. Word of the attack reaches Fuso and a support battalion is deployed to rescue the survivors. Among the rescue team is the former Striker captain Mio Sakamoto and the now civilian Yoshika Miyafuji who want to save their dear friends.
 
(Source: Anime News Network)

In 1945, Yoshika Miyafuji, who lost her witch powers during the Strike Witches' last assignment, has been studying to become a doctor. Shizuka Hattori, one of her cadets in the Imperial Fuso Navy, then arrives to deliver a message: Yoshika is to be transferred for study abroad in Europe. 
When their enemy reappears more powerful than ever, the Strike Witches must form up once again. But can they do it without Yoshika Miyafuji? 
(Source: Kadokawa, Crunchyroll)

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