Instant Spring (即席男溺泉 Sokuseki Nanniichuan?) is the 70th chapter of the manga and the first chapter of the Dojo Destroyer Arc. After coming home from her morning jog Akane notices that the dojo sign is missing. Upon checking with her father, she discovers that a dojo destroyer has beaten him and taken their sign as proof. Soun tells Akane and Ranma the the dojo destoryer will return on Saturday to face the two of them.