On the night before ‘Black Friday,’ which is the one of the busiest commerce days, a cardboard box, that is delivered from the world's largest shopping site, explodes. Soon after, a series of mysterious explosion cases occurs. The entire nation becomes terrorized by the shocking events. Funado Erena has just began to work as the center director for a large distribution warehouse that covers three-quarters of the Kanto area. Erena must gain control over this unprecedented situation with team manager Nashimoto Ko. (Source: AsianWiki)