CUSA06927 – EUR Language : English-Japanese ( Guide Download – Tool Download ) The Chimera Virus in its beginning stages would wipe out 3% of the world’s entire population. In a state of national emergency, Japan became a closed nation in an attempt to stave off the pandemic. A covert military agency known as ACID was established to combat the remaining Chimeras in country. Time passes. ACID establishes a special unit known as Special Force Valkyrie in order to eradicate the Chimera that threaten humanity to this day.