"Hentai Heaven Collection 3.5 contains stand alone episodes Invasnion of the Ballbusters and Green Eyes.

Invasion of the Ballbusters takes place in the near future when a viral plague sweeps the land and infects only the women, transforming them into sexcrazed maniacs. As the horny horde of harlots prey upon unsuspecting, defenseless men, Nii-Chan and Tsugumi, fight off the virus-infected vixens and find a temporary safe haven where they can’t seem to resist their own primal urges! Will they survive the virus and resist the urge to explore their own perverse feelings for each other? This OVA is based on an erotic game by Speed.

In Green Eyes, Haruto and his demanding but beautiful, green-eyed, sister, Makabe, enjoy a strange relationship. Makabe treats her brother like a servant, ordering him around to run trivial errands and perform menial tasks. When her dominance takes a turn for the kinky and erotic, Haruto has little choice but to become her personal plaything and satisfy her every forbidden urge. This OVA is based on the erotic manga by Yuzuki N’."