Shinichi used to be an ordinary high school student, but now he is keeping a dark secret about the parasites that have invaded Earth and taken over the bodies of thousands of unwitting victims. It's a secret too dangerous to share, but too big to cover up, and Shinichi is stuck in the middle. Then he meets Kana, a bold girl with a strange gift that grants her the ability to detect the parasites...and Shinichi! Will Kana end up being ally or hindrance to Shinichi as he tries to maintain the careful balance of his own existence?