Elena feels lonely seeing her brother-in-law go out to play pachinko every day, yet she grows closer to her younger brother-in-law. Her dedication to household chores excites him more and more, making it impossible to control his arousal. Every time her brother becomes absorbed in pachinko, her relationship with her younger brother-in-law deepens further. Though her heart aches, her body craves his warmth. Despite being related only by marriage, their physical intimacy profoundly shakes his emotions. As days pass, he finds himself increasingly drawn to her body.