When it comes to public safety and terrorism in Japan, nobody probably knows the situation better than Takaji Kunimatsu.
The former chief of the National Police Agency dealt with a number of high-profile crimes during his career, including the 1972 Asama Sanso Incident, a hostage standoff by five armed members of the United Red Army, and a series of terrorist attacks by Aum Shinrikyo, including the 1995 sarin gas attack on the Tokyo subway system.
While Japan has yet to come under domestic attack by foreign terrorist groups such as Islamic State, experts and many in society fear that the country could face such a risk as more people visit, study and work here.