In the depths of a Vietnamese jungle, Duc N'Go discovers an unusual bat roost. These aren't ordinary bats; they're kinky creatures with an inverted fetish. Duc, intrigued, films their long, fun-filled nights as they engage in wild, kich nguc (upside-down) sex. The sight of their tiny, upside-down penises pumping in and out of their partners is a sight to behold.