２月15日。
乃木坂*1。港区南青山１丁目。
千代田線乃木坂駅*2。
*1:See also https://sumita-m.hatenadiary.com/entry/20120209/1328760047 https://sumita-m.hatenadiary.com/entry/20170602/1496329662 https://sumita-m.hatenadiary.com/entry/2020/02/16/094934
*2:See also https://sumita-m.hatenadiary.com/entry/20100105/1262664650 https://sumita-m.hatenadiary.com/entry/20170516/1494943973