Cultivating Immortality, Starting with Finding a Sword Immortal Older Sister

In Lanzhou, a young woman finds an immortal's sword in the marketplace and takes a white flood dragon into a pot. She enters an underground palace, crosses the River of Forgetfulness, and a Buddhist holy man willingly becomes her younger brother. From then on, the woman and the flood dragon venture into the mortal world, gathering merit, seeking immortality, and discovering the world.