A spin-off of focusing on the rivals of the Teekyuu girls.

Teekyuu is based on a sports comedy manga of the same name featuring four high school girls who belong to a tennis club. 

The girls of the Usakame High tennis club, Tanaka Kinako, Suzuki Ayako, Sato Kurumi, and Nishiarai-Taishi Nishi, pursue their various dreams... This high school comedy kind of thing starts now.<br>
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Usakame, the official rival of the high intensity comedy Teekyuu, depicts the mostly ordinary but slightly strange daily lives of four girls who devote themselves to practice.<br>
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(Source: Crunchyroll)

An extra episode included with the Blu-ray.

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