Bundled with the 11th and 12th volumes of the manga. 

The OVA adapts the manga's chapter 17 from the fourth volume, where Miia, Cerea, Mero, and Kurusu go to the gym's pool.

In a modern world where beast people exist and live with other humans, they have a regular household where a student lives with a lamia named Miia. The student, Kurusu Kimihito, came to live with Miia because of the culture exchange that has been going on with humans and sub-species alike. This is their story.

Monsters: they're real, and they want to date us! 
 
Three years ago, the world learned that harpies, centaurs, catgirls, and all manners of fabulous creatures are not merely fiction; they are flesh and blood - not to mention scale, feather, horn, and fang. Thanks to the "Cultural Exchange Between Species Act," these once-mythical creatures have assimilated into society, or at least, they're trying. 
 
When a hapless human teenager named Kurusu Kimihito is inducted as a "volunteer" into the government exchange program, his world is turned upside down. A snake-like lamia named Miia comes to live with him, and it is Kurusu's job to take care of her and make sure she integrates into his everyday life. 
 
Unfortunately for Kurusu, Miia is undeniably sexy, and the law against interspecies breeding is very strict. Even worse, when a ravishing centaur girl and a flirtatious harpy move in, what's a full-blooded teenage human with raging hormones to do?! 
 
(Source: Anime News Network)

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