I Got Married to the Girl I Hate Most in Class (manga) Vol.

A MARRIAGE BETWEEN ENEMIES GETS REALArchenemies Akane and Saito got married because their grandparents forced them. They only agreed so their families wouldn’t stand in the way of their dreams, and they kept the marriage secret from their classmates. Nobody was supposed to fall in love! Now, Akane’s finding herself telling Saito to stay away from other girls as she becomes aware of her feelings. Meanwhile, Saito considers what Akane is to him. Could this marriage of convenience turn into a love match? The enemies-turned-newlyweds romantic comedy continues!