I am an experimental physicist. I am hunting for new phenomena such as neutrinoless double beta decay, dark matter scattering with heavy nucleus, etc. The discovery of any of them would improve dramatically our understanding of the universe. They are extremely rare if ever happen. The studies are hence carried out in underground laboratories providing better shielding of cosmic rays. I am currently working on the XMASS experiment. It was designed as a general purpose detector aiming at the direct search of dark matter, neutrinoless double beta decays and further study of solar neutrinos, etc. It is currently under construction in the Kamioka Underground Observatory. The construction is finishing very soon. Many exciting studies are ahead.