Episode 0, consisting of two subepisodes: "Sekirei Shindan" (鶺鴒診断) and "Sekirei Yoka" (鶺鴒余暇), of Sekirei: Pure Engagement included on the first DVD/BD volume.

The year 2010 AD. Romani Archaman has been posted to Chaldea. There, he becomes the primary doctor for a young girl. Mash Kyrielight, Chaldea's second successful summoning experiment, is interested in the word "Senpai." The interaction between the two gives Mash a reason to hope. That hope becomes a wave and starts to spread. That is your story, the story of a normal "somebody." The story at the beginning of a journey that weaves the future. (Source: AniplexUS)

Misuzu Moritani is an introvert who has always had difficulty interacting with her classmates, quickly becoming flustered whenever someone tries to talk to her. Sometimes, she will use her ability to stop time for three minutes to escape troublesome social situations. One day, as Misuzu watches the suspended environment around her, she observes that her classmate, Haruka Murakami, is somehow able to move despite her temporal influence. From that moment on, Misuzu experiences new wonders as she explores more of the world she has long avoided; no matter where time may take her, Misuzu can count on Haruka to always be at her side. [Written by MAL Rewrite]

The "Howard Resort Hotel" is an entertainment destination where people gather from around the world to grab huge fortunes. In the casino is a beautiful female dealer named Rio Rollins, known far and wide as the "Goddess of Victory". In order to approach closer to her mother, one of history's greatest dealers, she does battle to gather up the legendary cards called "gates". Those who gather all 13 gate cards are presented with the title MVCD (Most Valuable Casino Dealer), proof that they are a top dealer. Set in a vast resort, an exciting battle begins with rival dealers that'll take your breath away! Throw in some "supreme comedy" and a story that makes you cry when you least expect it, these cute and sexy girls will explode off your screen! With everyone's cheer of "Leave it to Rio!", Lady Luck'll be with you, too!