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。, Im Getting Married to a Girl I Hate in My Class, Kurakon, クラ婚, I Got Married to the Girl I Hate Most in Class, クラコン

A high school student named Saito Houjo recently tied the knot with his classmate, Akane Sakuramori, who he considers his greatest competitor at school. Despite their initial difficulties in getting along, their new life as husband and wife is about to begin.