It's rainy and very cold this morning here in Tokyo after extraordinary hot days, not warm but literally hot. I got up and felt chilly in the early morning. It's alike in November. Before the pandemic, a first case of flu was reported in the Northern part of Japan, when temperature goes down drastically. According to the authority, in Hokkaido the number of cases of the COVID-19 rises last week abruptly after a fall of temperature. The COVID has become a kind of seasonal disease here in Japan.