Neutrinos are mysterious particles in our universe. We observe neutrinos from the Sun, Atmosphere, Supernova, Reactors, and Accelerators. In the study of neutrinos, we explore particle physics, astrophysics, and cosmology. In Japan, neutrino physics is very popular with two Nobel prizes: One is to Prof. Masatoshi Koshiba with the observation of supernova neutrinos and the second is to Prof. Takaaki Kajita with the discovery of neutrino oscillations. In this webinar, we introduce Neutrino Physics in Japan conducted with a gigantic neutrino detector, Super-Kamiokande. Super-Kamiokande is the detector by which we discover neutrino oscillations from atmospheric neutrinos. Besides, Super-Kamiokande observes neutrinos from Sun and accelerators. In Japan, we have a powerful accelerator (called J-PARC) that provides the most intense neutrino beam in the world. By using the accelerator neutrino beam, we conduct the neutrino experiment T2K to study neutrino oscillations in detail. We report the Super-K and T2K experiments in the webinar. In 2020, a new and larger detector than Super-Kamiokande, “Hyper-Kamiokande”, is approved in Japan for further studies of neutrinos. We also introduce the Hyper-Kamiokande project briefly.