A grandfather and his grandson ferry the souls of the dead across the River of Forgetfulness in the underworld. These souls cannot afford the fare to cross the Naihe Bridge. During their time on the river, the pair encounter all sorts of events and hear many tales. Later, when the grandson reaches a bottleneck in his cultivation, he asks Black and White Impermanence to take him on a journey of trials. Along the way, he experiences all kinds of strange and extraordinary adventures firsthand.
