Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons.
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Is This a Zombie? OVA, Kore wa Zombie Desu ka? Episode 13, Koreha Zombie Desuka? OVA, Kore ha Zombie Desu ka? OVA, Kore wa Zombie Desu ka? of the Dead Episode 0, Ee, Kore ga Saishuukai Desuka?, Hai, Encore Arigatou Gozaimasu, これはゾンビですか? OVA