A short OVA for those who enjoyed the original Trinity Seven anime.
An amusing story of Arata trying to get an essay about all seven archives.
And to accomplish that? You guessed it, fanservice for all, but I ain't complaining.
If you greatly enjoyed the main series, the OVA will absolutely be a nice cherry on the cake. There's also a nice little surprise at the end, so make sure to enjoy the full ride!