[Machine Translation] No. 4 security, that is, bodyguard services by a private security company. Asahina is a former police officer with a strong sense of justice, and Ishimaru is a middle-aged coward. Although they are completely different in age and personality, they begin to trust each other as they protect various clients as partners in No. 4 Security. At the same time, the criminal who committed the crime that led to Asahina's resignation from the police force is released from prison in the middle of his sentence. Facing their past fate, what will they find?