An explosion take place in a street of Tokyo. Many people were killed or seriously injured. One casualty is Chihiro, the wife of Public Security chief inspector Kuraki Naotake.

While trying to find why his wife was being implicated in the explosion case, Kuraki comes into contact with Public Security sergeant Akeboshi Miki and Metropolitan Police Department inspector Osugi Ryota who are also investigating this case.

SP, also known as Security Police is a Japanese television drama based on the real life security police unit of Japan which is responsible for protecting domestic and foreign VIPs. The series script was written by famed GO author Kazuki Kaneshiro and marks his first time writing for a television drama. The drama centers on a newly recruited SP officer named Kaoru Inoue, who is the only SP officer known in the force to have sharp senses that enables him to conduct his duties by using this ESP sense to take down the threat before it appears to threaten the VIP and the civilians who are caught in the middle.

The franchise consists of the TV series, two film adaptations of the series released in 2010 and 2011 with an ongoing manga adaptation.