Creepy fucking edgelord.
Heres some stuff that may lead to him getting caught by the police or whatever vigilante the story has, like black bike.
1. There is a record of him entering a karaoke room with the two ladies, and anyone outside can see that he was the only one to leave it while holding suspiciously heavy looking briefcases roughly the size of two adult women. Plus, karaoke rooms usually have cameras(I hope) or at least outside it.
2. If the police ain't incompetent, theres probably an ongoing investigation on the string of disappearances of random people.
3. The website he uses to scout victims can be accessed by anyone as far as I can tell, it wont take long for a smartass to see it and track his location.