 The study examined the potential effects of climate change on extreme precipitation in the Japanese river basins. It compared two different approaches, a risk-based approach and a storyline approach, to estimate how much precipitation could increase as a result of climate change. Both approaches showed that the amount of precipitation could increase significantly in the future, but the risk-based approach was more accurate than the storyline approach. This article was authored by Tomohiro Tanaka, Hirookiko Waze, Yukiko Imada, and others.