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I have always been fascinated by the complex movements of cell collectives and the self-organization of multi-cellular tissue morphology. So far, I have studied organ morphogenesis in developmental biology from the viewpoint of mechanical forces; however, I am not particular about the subject. Two characteristics define me as a scientist. One is curiosity about “living systems” which integrates the dynamics, force, and shapes of cell collectives underlying biological functions. The other is the methodological combination of biological experiments and mathematical models. I am particular about using both the experimental and mathematical approaches, such as mathematical modeling based on measurement data of cellular dynamics and molecular activity or experimental verification based on mathematical prediction. In the Hakubi project, I am stepping into reproductive biology, a new research field to me. Based on the “sperm turbulence” discovered using intravital mouse imaging, I will clarify the biophysical mechanism of the characteristic collective sperm flow generated in vivo. Additionally, how the collective sperm dynamics and forces together with the geometry of the field relate to reproduction, one of the critical life events, will be explored.