An emergency order has been issued. The Soreddo Group has threatened to poison the capital's water supply. Immediately afterward, Special Investigator MIO swiftly heads to the capital's water purification plant, launching operations to prevent the attack and fully apprehend the Soreddo Group. However, moments after his arrival, the situation escalates beyond expectations. Members of the Soreddo Group, who had been secretly lying in wait, are now initiating their move. Amid intense tension and extreme danger, how will MIO capture the criminals and protect the city's water? Step by step, his battle begins here.