My Plain-looking Fiance is Secretly Sweet with Me

“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 year of middle school, I went through a bad experience. Ever since then, I’ve only been interested in 2D heroines. There’s absolutely no way I’d ever be interested in a 3D girl. That was what I thought, but… “…Well then, who’s your favorite heroine right now?” Turns out, she was actually an otaku and she becomes very talkative when you get to know her. She’d alway...