俺の許嫁になった地味子、家では可愛いしかない。 (Associated Names)

“Onii-san, congratulations on your marriage. This person is your bride.” “M-my name is Watanae Yuuka… I’m in the same class as you…” My name is Sakata Yuuichi. I’m in my 2nd year of high school. Due to my parents’ circumstances, I’m suddenly getting married..? Furthermore, my partner is a plain girl, Watanae-san. During my 3rd…