Accelerator, the most powerful psychic in Academy City, is quietly recovering from his injuries when trouble literally lands in his bedroom. A group of anti-evil zealots who call themselves "DA" are causing havoc, and it could threaten the city―not to mention the entire world! Although he hates to be bothered, a world-shaking threat may be enough to get Accelerator out of bed...especially if it involves the adorable Misaka Mikoto clone, "Last Order."