A ronin student living in his older brother's apartment like a freeloader, I harbored an irrepressible, inappropriate desire for my kind and beautiful sister-in-law, even as I hoped to finally pass my exams this year. One day, my brother left for a three-day business trip. For 72 hours, I was alone with my sister-in-law. All the pent-up emotions I'd suppressed came bursting out—I spent every waking (and sleeping) moment passionately making love to her, again and again, in a feverish obsession that deepens this story beyond mere lust.