Go to the soup shop in Hayakawa village, turn left, and head toward the white peak area. Look for a large bush near a sign where a crystal often spawns.
Located near the area where Rengoku spawns. Jump down into the cave (be careful of the Axe Demon) and check the upper corners by jumping up. Go to the soup shop in Hayakawa village,
Check out these video guides to see the exact parkour paths and visual markers for these rare spawns: Go to the soup shop in Hayakawa village,