Erika, the sole female member of the Marshall Force known as Marshall Pink, was fighting against Ego, an evil secret society plotting world domination. One day, while in a desperate pinch during battle, Pink is rescued by Higuman, an anti-Ego annihilation weapon developed by Dr. Kagaya. However, Erika clashes with Dr. Kagaya, who tortures his subordinates and ruthlessly suppresses even the most helpless enemies. Abandoning the Marshall Force, Dr. Kagaya teams up with Ego to plot Erika's elimination using Higuman... [BAD END]