As a result of a drastic of environment and an unknown contamination, in the year 2012, every male on the face of the earth dies out in a short space of time. Most of the remaining females perish after fighting in a world war over their territory. The only survivors are the 20,000 women in the Shinjuku area. People are huddles together in this corner of the planet, which has turned in to an ocean of trees. Within this small, all-female world, humankind divides in to two groups. One group accepts their fate to perish and decides to give up their lives to pleasure. The other group strives to create their own future through the powre of science. It's the beginning of an intense battle between these two forces over "ICE" samples, said to be the only hope for mankind.