I Got Married to the Girl I Hate Most in Class (Light Novel) Vol. 4

A SURPRISE GIFT FROM THE STORK?
Just as Saito and Akane’s relationship is on the mend after another storm of misunderstandings, a new addition joins the household: Akane’s little sister Maho!
Akane swings into full mother-mode as she dotes on Maho, while Saito is swept up in the chaos of having to live with not one, but two Sakuramori girls.
To make matters worse, Maho suddenly approaches Akane with a shocking proposal that leaves the newlyweds rocked to the core. Akane realizes that what Maho asks for is the one thing Akane cannot give her spoiled sibling. Can the newlyweds face both their fears and their feelings and end up stronger than ever?
Series Overview: Archenemies Hojou Saito and Sakuramori Akane have a notorious reputation as bitter rivals at their high school. Without fail, the two can be found bickering and arguing every day, making school their own personal battleground. But their relationship takes a drastic turn when Saito’s domineering grandfather delivers a shocking ultimatum: marry his rival or lose the family business to the dog!
Saito reluctantly accepts his fate, and to his complete surprise, Akane agrees without a fight. And just like that, they’re a married couple! Now, these rivals-turned-newlyweds must navigate living under the same roof and sharing meals (and a bed!) all without tearing each other apart. Can they manage to live together in peace and keep their embarrassing circumstances a secret from their classmates?