After her husband's parents die, Kanna, a married woman, has to temporarily live with her brother-in-law. She spends her days trying to reconcile her husband and brother-in-law, who don't get along, but suddenly her mind is swapped with her brother-in-law, who she lives with. Confused by this impossible situation, the two become immersed in their Kokoro about the body of the opposite sex and in unknown pleasures. Where will these two sex-addicted people end up?