“…Many studies have noted that during this contentious situation, public response to restriction measures has polarized into two extremes, creating serious conflicts in society (e.g., Dyer, 2020 ; Hart et al, 2020 ; Mehrotra, 2020 ; Kerr et al, 2021 ). Extreme attitudes on the pro side, termed as Pro-extremism in this study, seek thorough restrictions to suppress the spread of COVID-19 and sometimes show strong hostility towards those who do not comply with the restriction requests ( Takahashi and Tanaka, 2020 ) while the extreme attitudes on the contrarian side, termed as Con-extremism , show a vocal opposition against the restrictions, as seen in media reports of anti-mask protests and COVID-19 conspiracies ( Taylor and Asmundson, 2021 ; Jabkowski et al, 2023 ). Particularly in Japan, as a Pro-extremism , the phenomenon of ‘self-restraint police’ appeared during the state of emergency ( Osaki, 2020 ), which is a colloquial term for ordinary citizens who harassed individuals or shops that did not comply with the government’s request to refrain from going out or opening for business.…”