Souma Tooru, once a fearless hacker, is forced to join the ranks of FLAK. Indentured into service and out for revenge, the young man reflects on the dead of the past as a ghost takes shape in the present.
A joint exercise between VSS and FLAK goes horribly wrong. Tooru's hunt for Yuuya's killer is interrupted by an encounter with a strange little girl named Ren.