People turn into plants and attack...a unique suspense! Hazuki lives with a high school girl, Senka, for some reason. However, there is something strange about Senka lately…… Then, Hazuki hears an eerie rumor, though she thinks it's ridiculous, she begins to suspect that Senka has been replaced by a fake Senka, even though she thinks it's absurd. Meanwhile, at the same time, two mysterious men are investigating Hazuki's apartment......? A human hijacked by a plant is making more and more companions without being noticedーー Stop the apocalypse from creeping up on you without making a sound! A unique suspense action starts!