The Anti-LiNKER is a drug that temporary raises the link coefficient of a user. It has become an invaluable part of this world and was further researched and developed by Dr. Ver.
The gas from episode 3, which when released inside the hospital and inhaled by the users caused them pain due to a lower link coefficient, was taken and repeatedly developed, primarily to raise it to the point of immediate effectiveness.
The code name of this product was ALi_model_K0074_L.
"model-K" named after the girl who was used as the first test of the drug, and now being used against Shirabe is the 74th improved version, a fluid type.