Purpose: The primary research question in this study concerns the establishment of a platform for intercultural collaborative lesson study, which promotes reciprocal dialogue between culturally distinctive educational research groups. Therefore, this study aims to introduce a case of intercultural collaborative lesson study projects between Hiroshima University and Leipzig University and to illustrate the issues in intercultural collaborative lesson study. Design/methodology/approach: This study reconstructed the sequence of the project as a case under the narrative structure. Data were retrieved from a collaborative project between Hiroshima University and Leipzig University, which corresponds to the theoretical framework, as they represent a clear cultural contrast. The description of the project is reconstructed and reduced into a linear storyline of procedure. Findings: This study identifies three key issues: (1) sharing data and culture, (2) visualising methodology and process, and (3) responding to research questions and answers. Research limitations/implications: This platform does require one cultural group neither throwing their own norms away nor creating an utterly new paradigm beyond their own cultures. It is a place "between" original places that enables groups to capture their own culture and another culture, which does not compel to change but effectively allows reflection and changing themselves. Originality/value: Although several transcultural reports find that one cultural asset is imported and exported, the arena of bi-directional intercultural dialogue remains undeveloped. The collaborative project between Hiroshima and Leipzig is then introduced and examined to overcome the current problems in transnational lesson study.