The "Guinea Pig" series has garnered controversy for its depictions of violence. One or more entries in the series were suspected to have influenced Tsutomu Miyazaki, a serial killer who kidnapped and murdered four young girls. The second film in the series, "", was supposedly withdrawn from the market, and has achieved particular notoriety because of an incident in which American actor Charlie Sheen is said to have watched the film and believed that it depicted the actual killing and dismemberment of a real woman, prompting him to report it to authorities.