Shinya's wife left him because of a casual remark. Shinya apologises desperately but his wife's mood doesn't improve. While he is at a loss, his wife's sister, Karen, comes to mediate between the couple. Karen seems strangely close to him, perhaps out of concern for him. Just being stared at by her beauty makes his heart beat faster. He can't go on like this. He tries to cool his head by taking a shower, but for some reason Karen also comes into the bathroom.