My research interest is to find out a definition of habitable rocky planets such as the Earth with theoretical and numerical modeling of deep planetary interior with an integration of 'whole planetary system' evolution model. Currently, three quantities are focused on: 1 Evolution of ocean and global-scale water cycle in plate tectonics driven by mantle convection, 2. Sustainability of geomagnetic field over millions and billions years and 3. Long-term climate evolution in plate tectonics (active) and stagnant lid (inactive) planets. In addition, my research interests is also to understand the habitability of icy body in the solar system and exosolar rocky planets and to develop a synthetic database so that researchers who are not familiar with numerical modeling may interpret observational data imaging the Earth's deep interior (seismic, electromagnetic, gravity).