This study aims to understand how and why a historic building of Catholic Tetori Church was restored promptly after Kumamoto Earthquakes in 2016. The study revealed the lay members of the Church were the main force: they, some of whom were building professionals, had established the building maintenance system since 2006 and carried out preventive maintenance. Such a proactive attitude was nurtured by the progressive Columban missionaries. The laity also find voluntary maintenance activities a joy to serve God and fellow Catholics, hence, devote more time after their retirement. These factors prevented serious damages by earthquakes and enabled prompt restoration.
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