His nostrils went wide, as they always did when she brought up his not-so-secret shame. Marushige had an implanted monitor-dispenser system to keep him supplied with special psychoactive drugs, chemicals to control the imbalance in his brain that fostered violent rages. Before the implant, he had been a slave to his impulses and had almost been dismissed from the corporation. The drugs corrected the problem, but the occasional inaccuracies in the chip’s calculation of dosages let Mr. Hyde crawl out. Marushige, desperate to hold his position with Renraku, did his best to cover up those lapses. His shame gave her a powerful hold over him.