Susumu Tokunaga, a substitute teacher is back to his hometown for what might be his final course as he becomes unwilingly involved in a series of dissapearances and grisly murders. Dramatic events unravel the mystery surrounding the disappearances of dozens of citizens and with a serial abductor/serial killer using social media to showcase his "works", Tokunaga has to decide wether he's going to protect his childhood crush or to fulfill his duty.