One day, security officer Asahina is appointed to Security #4. Skills are required because it is the most dangerous of security roles. Asahina used to be a police officer but retired due to a “setback” and joined the security company Guard Keepers. A middle-aged man called Ishimaru is designated his partner. Ishimaru was once a company president but became a security officer and is labelled “coward” as a result of his excessively
