[Machine Translation] The ground has been contaminated by an unidentified fungus called "flooding body," and people have fled to underground cities, living in fear of delirium caused by the flooding body and leading inconvenient lives. The only people allowed to go above ground are "dispatchers" who conduct research and investigation of the flooding organisms. Terin, a young girl who lives in the underground city of Rabvawa, is fascinated by her mentor, dispatcher Isef, and takes the difficult exam to qualify as a dispatcher. Just before the dispatcher's exam, however, Terin experiences a strange auditory hallucination. Someone is inside him! -It was a prelude to a fateful event that would reveal Terin's hidden past and change the relationship between mankind and the floodwaters....