Mushi-Uta

In a nightmarish Earth, bugs (mushi) have begun to infect humans. Though not hurting their hosts initially, eventually the mushi devour the hosts' dreams, killing them in the process. Humans that are "lucky" enough to have their mushi killed ahead of time become emotionless and thoughtless zombies. In this uncertain time the Mushibune, infected humans who resist their persecution, are up against the Special Environment Preservation Agency, an organization hell-bent on destroying the mushi. Kakkou, SEPA's top agent, has been sent undercover to track down a high school student; but he didn't realize he'd meet and fall for the lovely Shiika instead...