After moving into her fiancé's family home, Airi discovers that his brother is the man who once drugged and raped her. She moved away to escape him, but their shocking reunion leaves her trembling uncontrollably. Her vile future brother-in-law calls it fate and sneers that his sex pet is about to become his adult sister-in-law. Obsessed with repeatedly raping her, he traps her once again with no apparent escape.