"Did you buy something strange from a door-to-door salesman again?" I was worried about my wife Erina, who is easily deceived because of her honest personality, and I was worried about going on a business trip tomorrow. The reason was that my father, who has been a huge womanizer since I was a child, and my weak-willed wife would be alone under the same roof. However, the two of them are family... step-parents and children... I never thought they would have a relationship... I had no idea at the time that this naive idea would lead to a tragedy...