オルガファイターAYANA―Departure―

Ayana Kirisaki, the hentai bishoujo who loves sex. Born of tentacle origin she will go on fulfill the legend of her species, and fight as an Orga Knight in defense of her galaxy and tentacle planet.

But today...
Ayana has no idea of the future. She's just an ordinary schoolgirl living an ordinary life in Neo Tokyo.

A new virus breaks out, turning everyone into sexual weirdos. This so-called "otaku flu" sweeps the city. To stop the epidemic from further spread Neo Tokyo is quarantined. Otaku flu victims are limited to otaku schools in the otaku district.