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.

Sentaro Daimonji returns in need of Ranma and Akane's aid. It is explained that an opponent is planning to steal the "Golden Teapot of Enishi", that of which the rival schools have fought over for generations. This procedure was to test the unity of the orthodox and unorthodox schools of martial arts tea ceremony.