Research has shown that the COVID-19 pandemic clearly brought huge impact on mental health of various populations in Asia (Tandon, 2021a) as well as in other part of the world (Vindegaard and Benros, 2020). Current evidence is limited to immediate mental health impact of the COVID-19 pandemic (Singh et al., 2020). An unsolved question is if the COVID-19 pandemic have a long-term impact on mental health (Dehghani et al., 2022). Traumatic experiences during the COVID-19 pandemic may cause a long-term impact on mental health of community adults, as often observed in a post-disaster setting. Poor development of cognitive and non-cognitive ability skills under limited chance of education and poor communication with teachers and peers may increase a risk of psychopathology of children and adolescents in future (Bhatia, 2020, Rider et al., 2021; Stavridou et al., 2020). A recent study by Japan Ministry of Health, Labour, and Welfare showed people’s strong need to study the long-term impact of the COVID-19 pandemic, as described below (Japan Ministry of Health, Labour, and Welfare, 2022).