Seeing his wife's horniness with his own eyes - Ai Sayama

On the way to a stop for a business trip away from home, but suddenly received news of the trip being canceled, the husband happily returned home to surprise his beloved wife, but arrived home. He discovered a strange pair of slippers and the laughing voice of his wife with a strange man. The husband sneaked into the house and hid under the bed to see who it was and what was going on. The ending was very unfortunate for him. This innocent husband