Mirei Aragaki is a researcher belonging to the Defense Special Incident Countermeasures Headquarters, an organization commonly known as DST. Her official role within the agency involves scientific research and technical support, but she enthusiastically describes herself as a scientist, the commander’s aide, and the designated heroine of the story. This self-appointed trio of titles reflects her vibrant and theatrical personality. She is energetic, outspoken, and highly self‑aware, frequently making playful, meta‑style comments about her own place in the narrative. She enjoys highlighting her abilities and status, and her dramatic flair often provides moments of levity amid the series’ action. Despite her sometimes exaggerated self‑promotion, she is a brilliant engineer with deep expertise in advanced military technology, including energy systems, stealth mechanisms, and control interfaces. Her work is essential to the special equipment and systems that DST deploys in its operations. As a supporting character, she acts as a bridge between the commanding officers and the field troopers, offering technical insight and occasional comic relief. Her interactions with other DST personnel and the troopers themselves are marked by a confident, sometimes cheeky manner, but she genuinely cares about the mission and the people she works alongside. Over the course of the story, she grows into her self‑proclaimed positions, proving that her confidence is backed by real competence. Notable abilities include a sharp scientific mind, resourcefulness in the field, and a knack for integrating experimental technology into practical combat support.