American and Japanese laws, customs, and practices in end-of-life decision-making differ significantly. We present a case with which one of the authors was involved to illustrate some of the key legal and cultural differences in the declaration of brain death, limiting and withdrawing life-prolonging interventions, and healthcare ethics consultation practices. The analysis presented facilitates understanding of similarities and differences between Japanese and American healthcare ethics specifically in regards to end-of-life care. Further, the analysis provides insights that can aid in developing policies and practices in regions where multiple cultures coexist.