The Japanese government has expressed that Japan intends to become a “hydrogen society” where homes and fuel-cell cars are powered by hydrogen, which is regarded as the CO2 emissions-free energy source, and has laid out plans for a “hydrogen highway” peppered with fueling stations, all in time for the Tokyo 2020 Olympics [1]. And also, a remarkable development of Fuel-Cell Vehicles (FCVs) has been achieved; for instance, Toyota’s FCV, “Mirai," which launched in 2014 after two decades of tireless research, recently rolled out in the US and Europe. This situation may give many people an impression that a “hydrogen society” will come true in the near future. But is this really true? In fact, there are so many difficulties to overcome before a “hydrogen society” is realized.