The “Good Stone Day” campaign will be valid until November 20 at 23:59 (JST).
November 14 was enacted as “Good Stone Day” by Yamanashi Prefecture’s Stone Grinding Cooperative in 1999, because the day can be read as a pun of “I-i-i-shi (1-1-1-4) no hi,” which means a good stone day in Japanese.
The TV anime adaptation co-animated by TMS Entertainment and 8PAN premiered in Japan on July 5, 2019, and has also been simulcast on Crunchyroll to its members worldwide excluding Asia.