You guys should think realistically, the setting is in the real world not fantasy, there's law here though twisted still law, you cant just kill someone then not be a criminal the police can track fingerprints and dna from hairs and other things in a crime scene even if you clean everything it would raise suspicion that the bas**** just suddenly vanished and the police will conduct a separate investigation that will link to sachi's kidnapping since its her teacher, the police will intensify the search since murder has been commited, be realistic bro