OVA released with the 9th volume of the manga.

Tomoya Aki, Megumi Katou, Eriri Spencer Sawamura, Utaha Kasumigaoka and Tomoya's cousin Michiru Hyoudou (all members of a doujin circle called Blessing Software) go out location scouting for their project, a video game. As Eriri attempts to get Megumi to act out a scenario for the main heroine, Utaha lures Tomoya away and forces him to act out a romantic scenario with her. (Source: Wikipedia)

Light showers accompany falling cherry blossoms as they flood the view of another April morning, marking the start of a new school year for students Homi Moegi, Ren Aikawa, and Yua Nakabeni. Discovering that they all share the same class, the three playfully reunite as the new semester begins. Starting another important time of their lives, the girls deepen their friendship through laughter, happiness, sadness, and all other struggles that come their way—all the while wearing dazzling, silky nylon tights. [Written by MAL Rewrite]

In the lead-up to a photoshoot in which Yua Nakabeni and Ren Aikawa have been invited to model for an illustrator, the two girls are feeling anxious. To help them out, their friend and fellow classmate Homi Moegi decides to run a practice shoot in hopes of easing their nerves. Yua and Ren repeatedly tense up during shots on their own, so Homi asks them to pair up for some couple shots, hoping that they will relax in each other's company. What begins as a series of cute poses soon turns into an alluring collage of legs encased in black stockings layered over one another.