Brain Candy deals with a drug company, Roritor Pharmaceuticals, that is in need of a hit wonder drug, launching a new and mostly untested antidepressant they call Gleemonex, which promises to locks its patient into the sensation of reliving their happiest memory. The new drug quickly becomes the number one on the market (even more popular than penicillin), as we follow several people who use the product, as well as the drug's inventor, and the CEO and board members of Roritor as they deal with the overnight success of their product.