The Japanese authorities continue to maintain some exclusion zones around the Fukushima Dai-ichi nuclear facility. Travel through these zones on some designated trunk roads is allowed. Follow local signs and instructions while travelling in this area. See Fukushima
The tropical cyclone (typhoon) season runs from June to December with most activity between July and September. You should monitor the progress of approaching storms and follow instructions issued by the local authorities, including any evacuation orders. See Tropical cyclones
There’s a continuous risk of earthquakes, volcanic eruptions and tsunamis throughout Japan. Latest warnings and advisories are published on the Japan Meteorological Agency website. See Natural disasters
In April 2016, Kumamoto prefecture was hit by two large earthquakes, resulting in damage to infrastructure. If you’re in or planning to visit the affected area, familiarise yourself with the advice of the local authorities on areas to avoid due to infrastructure damage.
The Japanese government introduced a new residency system for foreign nationals in July 2012. See Local laws and customs
271,600 British nationals visited Japan in 2016. Most visits are trouble free.
Although there’s no recent history of terrorism in Japan, attacks can’t be ruled out. See Terrorism
To contact the emergency services call 110 (police) or 119 (fire and ambulance). Calls are free of charge from any phone, including pay phones.
If you’re abroad and you need emergency help from the UK government, contact the nearest British embassy, consulate or high commission.
Take out comprehensive travel and medical insurance before you travel.
Source Article from https://www.gov.uk/foreign-travel-advice/japan