Change 123 follows Motoko Gettou, a not-so-average teenage girl. Orphaned at an early age after the death of her mother, she was taken in by her "three fathers," each a master of a different style of martial arts or combat-training. Under the care of each parent, a young Motoko was subjected to excessively rigorous training. So much was the physical and mental strain that Motoko developed three split-personalities, known as the HiFuMi, consisting of the ever hard-headed Hibiki, quick and agile Fujiko, and cute and immature Mikiri, each individually skilled in combat skills learned from each master. One day, a man begins to harass a terrified Motoko, now in high school, as he catches her alone down an alleyway. A classmate of hers, Teruharu Kosukegawa, tries to help Motoko, only in time to watch as an infuriated Hibiki kicks the harassing man directly across his path straight into a car. Returning to herself, a shocked Motoko promises Kosukegawa she will do anything if he doesn't tell her secret. From here poor Kosukegawa must manage a flurry of combat fighting and ecchi madness as he is brought along for the ride of his life into the chaotic lifestyle of HiFuMi. But what initially developed as a friendship seems to have become more to Kosukegawa as he longs to tell Motoko his feelings for her -- if he can manage to survive long enough to confess, let alone find the opportune moment. What will transpire?
Date Added: Jan 01, 1970