I have been working on development of optical and near-infrared astronomical instruments such as Subaru/FMOS, the Kyoto University 3.8m Telescope, and the Hiroshima 1.5m Kanata telescope/HONIR. At Kavli IPMU, I am in charge of the PFS (Prime Focus Spectrograph) project, mainly planning the system commissioning of the instrument. My research interests also lie in high-energy binaries (X-ray binaries and gamma-ray binaries), which are comprised of a compact object and a star. By monitoring the optical counterpart (the star) in these binaries, I probe the nature of the interactions and the relationship between the stellar activity and high-energy phenomena.