Overview of System Research by the RIKEN team and Activities of its Application Group in Feasibility Studies on Next-Generation Supercomputing Infrastructures We are working as an application group in the activities conducted by the RIKEN team for the Feasibility Studies on Next-Generation Supercomputing Infrastructures by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. The application group consists of subgroups conducting research activities in the fields of computational science, data science, and social science, as well as subgroups conducting research activities mainly in the field of computer science. In this presentation, we will provide an overview of the system research by the RIKEN team and introduce the activities of the application group as a whole, along with some of the efforts of the subgroups.