Introduction  Migrants are often more vulnerable to disasters than the native population. The purpose of the study was to investigate the factors that influence individual disaster preparedness among non-native residents in Japan.Methods  A web-based cross-sectional survey was conducted among non-native residents aged 18 and above who had resided in Japan for a minimum of three months and could answer questions in Chinese, English, Vietnamese, or simple Japanese. The survey collected data on socio-economic demographic characteristics, disaster preparedness (self-help and mutual help), and its factors (risk awareness, feasibility of disaster preparedness, awareness of disaster prevention, imperative norms, and social connectedness at the community level). Disaster preparedness for self-help included identifying evacuation shelters, checking local hazard maps, discussing disaster preparation with families and peers, having proper home equipment, and willingness to cooperate with disaster relief efforts as a form of mutual help. Factors associated with disaster preparedness were determined using a binary logistic regression analysis.Results  We received 207 valid responses. Respondents’ mean age was 33.8±10.4 years, and almost half were male (51.7%). For many respondents, the origin country/region was China (48.8%), with 27.1% respondents having been in Japan for less than 3-5 years and 37.7% being students. Regarding disaster preparedness, more than half of the respondents (67.6%) identified evacuation shelters, and a majority (93.3%) had a sense of mutual help. Multivariate analysis showed that being male, over 40 years old, living together, financial affordability, having never experienced a disaster, and having participated in community activities, are significantly associated with self-help. Meanwhile, having regular social contacts with native residents was associated with mutual help.Conclusion  It is suggested that connections with family and peers, interactions with the community, including Japanese people, and participation in local activities are important for promoting disaster preparedness among non-native residents in Japan.

A 51-year-old male was unexpectedly diagnosed with unroofed coronary sinus atrial septal defect (CSASD) by coronary computed tomography angiography for a complaint of epigastric pain. As there was no persistent left superior vena cava (LSVC), we planned to undertake a totally endoscopic MICS approach. A 4-cm skin incision was made on the right lateral chest wall under general anesthesia. The 4th intercostal space was used to enter the chest and the right femoral vessels were cannulated for cardiopulmonary bypass. After cross-clamping of the aorta, a right-sided atriotomy incision was made on the left atrium. The CSASD was located at the ventral and caudal regions of the mitral valve and the defect was closed using a bovine pericardial patch. No major postoperative complications were observed. The patient was discharged 7 days after the operation as postoperative transthoracic echocardiography revealed no residual shunt. We thus observed that totally endoscopic MICS patch closure via left atriotomy using a right-side approach for CSASD without LSVC was beneficial to the patient.