The gathered bloodsucking is either human or beast—an eerie incident occurs when a corpse is found with almost all of its blood drained. While investigating the sewer for clues related to the case, Narumi suddenly disappears without a trace—Kurako and Urara enter the drainage where Narumi vanished, hoping to find clues about the incident. Meanwhile, Narumi awakens in the sewer and discovers many women there. "We are preserved food..." Upon hearing this shocking statement, what does Narumi confront!? And what exactly is the "monster" in the sewer...!?