Ice

Ice is a 2007 three-episode original video animation created by Yasushi Akimoto and directed by Makoto Kobayashi. It is set in the ruins of Tokyo in the near future, after an unspecified catastrophe has led to the death of all human males and many females. The small groups of women who survive face the impending extinction of humanity. There are suggestions that the disaster was caused by human interference with nature, possibly biological warfare experiments or genetic engineering.