[Deceive Diello Argenta and steal his chastity.] This was the message from the vile Duke Alloge, who had torn his daughter’s back with the name of the enemy. The protagonist reincarnates as Croua Alloge, a villainess extra in the dark +19 novel The Three Dukes’ Houses. Ordered to disguise herself as “Phero," the fake fated partner of Duke Argenta, and bring down the duke’s household from within— She chooses instead to sleep with the enemy to escape her predetermined fate in the original story. “Let’s get married. Just for one year.” They enter a contract marriage for mutual benefit, pretend to be a passionate newlywed couple, and work to protect Argenta. But one year later, when Croua plans to leave Argenta, Diello reveals his hidden true nature! “I thought you were wise. But how can you know one thing… and miss the other?” Will Croua be able to escape Diello’s sweet obsession?