Koushaku Fujin wa Furin o Kimemashita

The Duchess Decided to Have an Affair / The Duchess Has Decided to Be Unfaithful / The Duchess Has Decided to Commit Adultery / "Please, even if you die, die by my side." Those were the words my unfaithful husband whispered to me when I demanded a divorce. Why? If he loves me, then why did he cheat on me? If he truly wants that woman, then why is he still so obsessed with me? To take revenge on him, I decided to cheat on him in return with the crown prince, my husband's childhood friend. But every time he touches me gently, the balance of my heart tilts more and more Who is it that I truly love?