After the failure of the "Happo Daikarin" or "Happo Fire Burst" technique of explosions due to the heavy downpour, Happosai invents the "Happo Daikabin" or "Happo Mold-Burst" technique, which releases clouds of paralytic mold. Ranma later trains with Shampoo and Cologne on the mountains, attempting to learn ways of dealing with the deadly attack.