Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku OVA

やはり俺の青春ラブコメはまちがっている。 続 「きっと、女の子はお砂糖とスパイスと素敵な何かでできている。」

An adaptation of a story from volume 10.5 regarding Iroha Isshiki.

After accepting a weekend invitation, Hachiman Hikigaya accompanies Isshiki Iroha around the Chiba Prefecture to brainstorm ideas suitable for an ideal date with Hayato Hayama. As the duo wanders from place to place without a plan, they seemingly enjoy each other's company. Yet, through these straightforward and sincere interactions, the meaning behind what it means to be genuine continues to intrigue Hachiman and his outlook for the future of the Volunteer Service Club and its members.

(Source: MAL Rewrite)