Senran Kagura: Estival Versus - Mizugidarake no Zenyasai is a one episode special celebrating the Senran Kagura: Estival Versus game on PlayStation Vita and PlayStation 4. On this episode, the girls hang around.
So since I have nothing else to watch at the moment, I decided to check this out and it's definitely a fan service episode just like the full anime season but is based on the latest game instead. Although the action was kinda cool as usual and there's some hilarious scenes. Other than that, I guess it's interesting enough that the OVA episode is celebrating the latest game in the series. Overall, interesting game celebration episode.
Conclusion: Interesting game celebration episode.