Injuu Daikessen
English name: Mission of Darkness
Genres: Hentai
Type: OVA, Episodes: 1
Aired: Sep 1, 1997
Studio: Momoi Planning
Source: Unknown
Rating: Rx - Hentai
Synopsis:
In this adult anime from Japan, a meteorite strikes Earth, and mayhem begins. Women are found murdered all over Japan, and the evidence points to aliens killing and depositing sperm in the victims. When the government tries to step in, they only make things worse, but suddenly an enormous Venus arrives with what may possibly be a solution...

(Source: Gavin Nelson)