2020年３月21日。
COCO'S*1 習志野市大久保４丁目*2。
*1:https://www.cocos-jpn.co.jp/index.html See eg. https://ja.wikipedia.org/wiki/%E3%82%B3%E3%82%B3%E3%82%B9%E3%82%B8%E3%83%A3%E3%83%91%E3%83%B3
*2:See also https://sumita-m.hatenadiary.com/entry/20150730/1438223216 https://sumita-m.hatenadiary.com/entry/2020/04/06/014410 https://sumita-m.hatenadiary.com/entry/2020/05/18/091354 https://sumita-m.hatenadiary.com/entry/2020/12/23/133417 https://sumita-m.hatenadiary.com/entry/2021/02/02/144734 https://sumita-m.hatenadiary.com/entry/2021/02/06/185051
