Daily news reports a number of break-through infection of the COVID-19 in the northern part of Japan recently. Air has become very cold and dry so that infectious disease is easy to spread rather than in wet seasons like summer. Now the number of COVID cases decreases day by day here in Tokyo. It is same with what we experienced last year. After the mid November, everything went worse than before. That is what we have learnt last year. We're still in the midst of the pandemic, and prepare for the winter season that goes with a next heat wave of the disease.