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

Class no Daikirai na Joshi to Kekkon Suru Koto ni Natta, I'm Getting Married to a Girl I Hate in My Class, クラスの大嫌いな女子と結婚することになった

A high school student named Saito Houjo recently tied the knot with his classmate, Akane Sakuramori, who is also his biggest competitor at school. Despite their initial incompatibility, their newlywed journey is about to begin.