fighting w/ shadows

NOTE: As my first truly original story (I have written only fanfiction before), I cannot assure you that the plot line will make any sense. So please, be nice to me.
When a normal, everyday guy from Tokyo gets an email telling him that he was chosen for a "personal experiment", he just couldn't help but get involved. However, he leaves the experiment brainwashed, with a porcelain mask attached to his head by wires. The only way to release the mask is to destroy the one and only thing he cares about...