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In the semi-fantasy world of the 1990s, the Cold War between the United States and the Soviet Union continues. At this time, a type of humanoid mobile suit called "Arm Slave" (AS) has become the main force in the military, and the new technologies related to it are coveted by various factions. The mercenary military organization "Secret Silver" possesses a powerful AS army, tasked with combating international terrorism. Sergeant Akihiro Misato (voiced by Tomokazu Seki), belonging to the SRT team under Secret Silver, is fierce and courageous on the battlefield. One day, he is assigned by his superior to, along with his teammates Melissa and Cruz, travel to Japan to carry out a protection mission. The target of their protection is the energetic high school girl, Chiyoko Chidori (voiced by Mayumi Asano). Chiyoko is straightforward and bold, serving as the vice-president of the student council. She is exasperated by Akihiro, who appears as a transfer student at Chiyoda High School. As a combat expert, Akihiro is rigid and lacks common sense in everyday life, often making shocking actions that cause constant turmoil and laughter in their school life. However, Chiyoko harbors a significant secret related to AS, and their future is destined to be fraught with thorns... This work is adapted from the popular light novel of the same name by Shun'ichi Goto.