The original animation will be titled "Kitto, Onna no Ko wa Osatou to Spice to Suteki na Nanika de Dekiteiru" (Undoubtedly, Girls Are Made of Sugar, Spice, and Everything Nice) and will adapt a story focusing on Iroha Isshiki from the original light novel's volume 10.5.
Yahari fans may find it a bit refreshing after a long waited OVA. Story is most similar to Volume 10.5 certain chapter and follows it's own in the later. After 15 mins we see the surprise unread element in LN. In concise we see the complete outing of characters rather than school environment Character development is most focused in this Ova, especially Iroha and Hachiman.