８月13日。
文京区湯島３丁目*1。
*1:See also https://sumita-m.hatenadiary.com/entry/20160820/1471623058 https://sumita-m.hatenadiary.com/entry/20170509/1494345963 https://sumita-m.hatenadiary.com/entry/20170510/1494387019 https://sumita-m.hatenadiary.com/entry/2020/04/02/103023 https://sumita-m.hatenadiary.com/entry/2020/08/14/132255 https://sumita-m.hatenadiary.com/entry/2020/12/17/101214 https://sumita-m.hatenadiary.com/entry/2020/12/19/084949
