While her husband was away on business, Yui had a relationship with her only son. - Even though I knew I shouldn't, my body couldn't bear the loneliness. - The relationship between the two continued quietly even after her husband returned from his post alone. - Yui is worried about when her husband will find out. - But as for his son... he was enjoying the thrill of the situation. - Before she knew it, Yui started being attacked by her son as soon as her husband went out...