５月８日。
サイゼリヤ*1京成大久保駅前店。習志野市大久保１丁目。
*1:https://www.saizeriya.co.jp/ See eg. https://ja.wikipedia.org/wiki/%E3%82%B5%E3%82%A4%E3%82%BC%E3%83%AA%E3%83%A4 See also https://sumita-m.hatenadiary.com/entry/20160814/1471186840 https://sumita-m.hatenadiary.com/entry/20161112/1478913484 https://sumita-m.hatenadiary.com/entry/20161121/1479655798 https://sumita-m.hatenadiary.com/entry/20171116/1510804316 https://sumita-m.hatenadiary.com/entry/20171117/1510892943 https://sumita-m.hatenadiary.com/entry/20180407/1523065536