While investigating the mysterious disappearance of a low-level drug runner, Tokyo police discover that a race of radioactive flesh-eating creatures are emerging from the sewers and attacking civilians. Set in the criminal underground of 1950s-era Tokyo, this effort from B-movie maven Ishiro Honda is an obscure precursor to sci-fi noirs like Jean-Luc Godard's Alphaville and Ridley Scott's Blade Runner.