If you play in a field in Japan, you should be careful

At present two serious tick related diseases are of concern in Japan. If you have a plan to take part in a field activity in Japan such as mountain climbing, you should be careful and you should prepare properly.

Severe fever with thrombocytopenia syndrome (SFTS)is an viral infection which is mediated by tick.
Main symptoms are fever, loss of appetite, nausea, vomiting, headache and muscle pain. There are no specific  therapy. Mortality is between 6.3 % and 30%.

Other concern is tick-born encephalitis, which is common in Russia and central Europe. This disease can be prevented by a vaccination, however it is not available in Japan. Once infected there is no specific therapy.
Recently several cases have been reported in Hokkaido, Japan.

In order to avoid tick related illness, you should be careful, when you enjoy activity outside of houses.

You should wear shirts with long sleeves and gloves. Long pants and appropriate shoes are necessary. Insect repellents can be applied to exposed skin.

If you find a tick on your skin, do not try to remove it for yourself. You should go to a hospital or a clinic.