On the night Mari returns to her husband's family home, she falls asleep from the exhaustion of the journey. Drowsily drifting off, she feels someone touching her body. Assuming it's her husband as usual, she lets it go, but the sensation feels somehow different. Opening her eyes, she sees her younger brother-in-law, Takashi. Shocked and confused by the sudden turn of events, her heart begins to tremble at his warmth. In the quiet of the night, her feelings grow deeper and deeper.