The Ultimate Technique (まぼろしの奥義 Maboroshi no ogi?) is the 106th chapter of the manga and the first chapter of the Happosai's Ultimate Technique Arc. Soun and Ranma lose their patience with Happosai after he burns their clothes and dojo sign so he can cook sweet potatoes. After Ranma tricks him by dressing up as a girl, Happosai decides to unleash his ultimate technique, the Happo-Fire Burst!