Update
The OVA of Akikan will be bundled with the volume 9 of Akikan! light novel.

Subtitle: Akikan! / Kan Ippatsu!!? Onsen Panic
Release date: October 23rd (pre-ordering will be closed on August 31st)
Duration: 25min
Price: 3,780 yen

Source: Pixiv Tsushin

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An OVA of "Akikan!" was announced to be released. The detail of the OVA will be given later on.

Source: Official website

Additional info:
The ED theme of the final episode was sung by Hatsune Miku. The Miku version was included in the official CD released on March 25th.

Source: Seven&Y