Just a small description about the hidden sis i manage to find around the map, seems like there are other sis who were against the glub inc. and tries to find life somewhere else,

• Glasses sis
  - Located at the back alley " near the fight sign on the wall "
  Note: Need to have 3rd pov view to see him
  https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2798519587
  
• Subway worker sis
  - Located at the Subway shop, seems to be holding a cat in a jar
  https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2798519976
  
• Hunter / Creep sis
  - Located inside the sewer, just right in front the bars before rochelle's box room
  Note: Try to use scope to get a better view of him
  https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2798520255

Am pretty sure there are other hidden sis' somewhere, let me know if you guys manage to find them~! :D