My sister-in-law came to visit Tokyo for a trip and ended up staying at our place. While my wife was away at work, her younger sister started getting close to me, seducing me deliberately. I found myself drawn to her, tempted to make my move, but feared the consequences if my wife ever found out. Caught between desire and dread, could I really resist her advances? A steamy, erotic story full of tension and temptation.