Shintaro is a freeter who is having an affair with married woman Hitomi. He initially only intended to have a fling, but he gradually becomes obsessed with the dark side of Hitomi. In fact, Hitomi's affair is approved by her husband, who is also a pervert who enjoys cuckolding. With Hitomi innocent Kokoro completely under control, Shintaro one day witnesses Hitomi and her husband having passionate sex right in front of his eyes. Hitomi continues to stare at Shintaro's face, stunned by the sudden turn of events. "I get really excited when I see a man looking sad..."