My husband is away on a two-week business trip overseas. It's good that he's so dedicated to his work, but I feel a little lonely. My husband's younger brother, who lives nearby, would come over to see me while my husband was away, out of concern for me. My brother-in-law, who I thought of as a real brother, suddenly attacks me! "Airi, don't say anything..." He gives me a passionate kiss, pushes me down, and I give myself over to him. Even though I know it's wrong, we end up getting entangled again and again while my husband is away from home...