Refrain (Drug)

Refrain (リフレーン, Rifurēn) is an illegal and highly addictive psychotropic drug that induces hallucinatory flashbacks to pleasant past experiences. Temporary behavioral abnormality is exhibited while under the influence of Refrain, and it is also useful as a truth serum. Once the drug wears off, the user is left unable to speak for some time and finally becoming an invalid.