TWoFCS 2026 is an international workshop that brings together experts researching nuclear and fuel cycle strategies based on numerical analysis. Since the first workshop held in 2016, six workshops have been conducted to date. In 2026, Japan will serve as the host. TWoFCS2026 will be jointly held with NuMBAC, Japan's nuclear fuel cycle simulation research community and workshop. NuMBAC has evolved to incorporate not only traditional technical perspectives of nuclear fuel cycle simulation but also social science perspectives such as economics and sociology. By jointly hosting TWoFCS and NuMBAC, we aim to stimulate interdisciplinary discussions toward the advancement of nuclear fuel cycles in the future, going beyond conventional technical discussions.