The “that day” referred to in the title is “March 11”; as the name suggests, it is a collection of short stories that were created and published at an astonishing pace in the immediate aftermath of the Great East Japan Earthquake. Amongst the four-frame manga published every day in the evening edition of the Asahi Shimbun newspaper were many that depicted the real state of mind and behavior of people at the time, based on the artist’s experiences of having visited the disaster-hit area as a volunteer. Moreover, the nuclear power issue is taken up and turned into a work of fantasy that incorporates the author’s characteristic sense of the absurd and nonsense.