The Enemies to Lovers trope has been gaining attention over the years. It occurs when two characters start out hating each other but become romantic partners in the end. In the case of Akane and Saito, they start off hating each other but are forced to get married for business and family-related reasons early on in I'm Getting Married to a Girl I Hate in My Class. They hold on to their hate for each other as long as they can, but it unavoidably starts wearing off, especially with them living together as newlyweds.