My research interest is to elucidate the origin and evolution of primitive solar materials (primitive meteorites and cometary dust) by combing systematic analysis using XCT, SEM, FIB, TEM, SIMS, IR and Raman etc. and experimental approaches (e.g., gas-condensation, aqueous alteration and ion irradiation). In connection with this research, I was performing analysis of returned samples form Comet Wild2 by the Stardust mission, Asteroid Itokawa by the Hayabusa mission (as PI of Hayabusa Sample Preliminary Examination) and Moon by the Apollo and Luna missions. Lately, I have started the analysis of samples returned from the asteroid Ryugu mainly on the 3D structures using X-ray nanotomography.