Kiseiju - L'ospite indesiderato

We humans are the dominating species on earth, deciding who lives and who dies, controlling all creatures we consider to be 'inferior'. Until one day spores, containing worm-like aliens, come to earth, starting to control some of us and, in order to survive, steadily consuming mankind.

These events, witnessed though the eyes of the main focalizer Shinichi Izumi, confront the viewer with many concepts and themes from modern philosophy: Egoism, altruism, deciding who lives and who dies, and who is the real parasite on earth? Is it the human who exploits his environment or the alien creature, which reduces mankind?

Not to mention that Shinichi, due to circumstances explained in the first episode, lives in a symbiosis with one of the parasites, being confronted with the problems of both species. He is now a human-parasite-hybrid, with all the flaws and advantages.

I personally liked this anime a lot, always catching myself thinking how I would have reacted in this or that situation :).

I've been hooked from the first episode onwards! Highly recommended.