Class no Daikirai na Joshi to Kekkon suru Koto ni Natta.

There is only one person that high school student Saito Houjou truly cannot stand—and that is his temperamental classmate, Akane Sakuramori. The two have always been on bad terms; their contrasting views and personalities only lead to endless fighting. However, everything changes when Saito's grandfather and Akane's grandmother arrange a sudden meeting and insist that the two get married!