In martial arts, the goal is to control the opponent, but in Aikido, the ultimate goal and essence is not to fight. Ryuichi Hashimoto, who studied Aikido under the teaching of ``Aikido is Aikido,'' returns to Japan after completing his training in Sweden. Ryuichi ends up living at his teacher Kodaira's dojo, but the day after he returns to Japan, a dojo breaker appears at the dojo...!?