I have been studying theoretical galactic astrophysics, mainly with numerical simulations and analytic calculations. Especially, my recent interest is in physical processes of high-redshift galaxies in their formation stages and how the formative galaxies are connected to the Milky Way in the current universe. Although I will keep studying galaxies, I am going to start out on a new field: the first stars! It will be so exciting for me to dive into a new project in a new environment.