A certain story of a sister-in-law and her brother-in-law. Reiko, the sister-in-law, lives with her brother-in-law's family while her husband Tatsuo is on an overseas business trip. Unable to endure the sexless situation, she was caught masturbating by her brother-in-law Yasuhiro, and they ended up crossing the line. As Yasuhiro became dominated by Reiko's body, he began to feel a desire to control her. Before he knew it, he found himself living a life where serving Reiko as a sex slave had become ordinary… And after Tatsuo returned from his overseas trip, Yasuhiro's demands escalated further…
