2021年12月31日。
新宿駅*1。
山手線。
小田急線。
*1:See also https://sumita-m.hatenadiary.com/entry/20060803/1154625015 https://sumita-m.hatenadiary.com/entry/20070329/1175189030 https://sumita-m.hatenadiary.com/entry/20090822/1250936684 https://sumita-m.hatenadiary.com/entry/20090912/1252725447 https://sumita-m.hatenadiary.com/entry/20120115/1326643979 https://sumita-m.hatenadiary.com/entry/20170211/1486822114 https://sumita-m.hatenadiary.com/entry/20180527/1527436801 https://sumita-m.hatenadiary.com/entry/20180527/1527436801 https://sumita-m.hatenadiary.com/entry/20180531/1527778555 https://sumita-m.hatenadiary.com/entry/2019/03/07/001330 https://sumita-m.hatenadiary.com/entry/2020/02/02/082238
