Today, Particle Physics and Cosmology are in a big turning point. The standard model of Particle Physics is well verified in a wide energy range up to TeV with the development of accelerators. Standard Cosmology describes Nucleosynthesis in the evolution of our universe, and firmly establish the existence of dark matter and dark energy. However, Standard Model and Standard Cosmology can not explain the origins of asymetry between matter and anti-matter in our universe, the origin of inflation, the unified picture between forces and particles consiting of matter. To understand a picture from the beginning of our universe to the present, we must innovate a novel concept of Particle Physics and Cosmology. We challenge to build the new concept of Particle Physics and Cosmology by studying "neutrinos" that are the essential key particle to address these unresolved problems.