In this conclusion, we consider the broader contribution of this edited volume to expand thinking via Japan as method towards more decentred and pluriversal approaches to knowledge production in Japanese international development studies (IDS). In order to highlight this broader contribution, we do two things. First, we synthesise findings from each chapter through the dimensions of time and space, in which the selected Japanese terms in the field of development cooperation were constructed, popularised, or spread. In doing so, we demonstrate how intricately the semantics of those terms change through the latter’s connection with many other—temporally and spatially different—worlds and their experiences, and highlight the risk of boasting Japan’s uniqueness in development knowledge production. Second, we then consider Japan as method to elucidate the case for engaging with decolonial and pluriversal approaches in Japanese IDS by exploring Japan’s ambiguous positionality and the post-war depoliticisation of Japanese IDS. Finally, we consider the potential of relativising Japan’s position in the (many) world(s) and to critically engage with the trend of instrumentalising ODA to serve geopolitical interests through active collaboration and co-creation of decolonial or pluriversal development knowledges that ‘leave no one behind’.