After the evil martial arts organization Arkundou kills her father, Dr. Minahara, Moka vows revenge by donning the powered suit "ZET Form" developed by him. However, as a mysterious woman lurks in the shadows targeting her, Moka must confront Arkundou's cunning schemes and brutal atrocities. This battle evolves beyond mere opposition, becoming a fierce story burning in the space between justice and evil. The protagonist, Eri Ka, carries her father's legacy in her heart and faces new enemies by fully mastering the power of her enhanced suit. Throughout this journey, the darkness hidden deep within her psyche gradually comes to light.