Naoto was already a loner way back when he was a teenager—such a wallflower that he might as well have been invisible. Eleven years on, he looks for and finds the only person who paid a modicum of attention to him back then, and he develops an ominous obsession for the young woman. Sneaking around the house in which she now lives with her husband and their baby, Naoto becomes witness to gruesome events. The Japanese genre specialist Mari Asato roots her intelligent stalker thriller in an unforgiving naturalism that thwarts simplistic formulas of good versus evil, making it a pretty damn challenging affair for the viewer.