Greatful Dead 2013

Abandoned by her philanthropy-obsessed mother and left alone by her suicidal father at a young age, Nami (Takiuchi Kumi) naturally grew up a little off-kilter. Obsessed with loneliness, her main hobby is spying on other lonely, anti-social introverts, whom she calls "solitarians." Her latest solitarian target: An old man (Sasano Takashi) who spends his time at home watching pornography. Nami grows progressively obsessed with the old man, and she soon crosses the line from peeping tom to kidnapper.