Is this a Zombie? OVA

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons. Season 1, Episode 13: Haruna is given the task to hold a Spring Festival at the local shrine, in her own magical-Equipment-girl way, of course... Seraphim does not want to be a freeloader at Haruna's and Ayumu's place, so she starts cooking... And a concentration-game contes...