Blue Gender ( Air Date 1999-10-08 ) Genre Animation, Sci-Fi & Fantasy, Action & Adventure, Drama category. Overview "In the 2030s Earth has been overrun by the Blue, which are mutated insect-like creatures that kill and harvest humans for food. Most of the surviving human race has moved to Second Earth, a huge spaceship that orbits the planet. Yuji and Marlene must work together to reach Second Earth and fight against the Blue.".