Kanojo o dere sa seru hōhō o, shōrai kekkon suru oreda ke ga shitte iru (Associated Names)

Using knowledge from the future to win her heart! Q: Why did you choose to apply to this high school? A: Because my future wife enrolled here. One day, my 30-something self woke up to find I had time-leaped 15 years into the past. Standing before me was the woman destined to be my wife,…