This one probably my favorite manga I've read. I don't know if everyone else finds it as hilarious as I do but, this one really make me laugh, even if the general plot make the main character seem a little sad.

"Wagatsuma-san wa Ore no Yome Manga Summary: Aoshima Hitoshi is a second year student in high school, who wishes he had a girlfriend. One day he wakes up for an unknown reason 10 years in the future, and he is married to the prettiest girl in school, Wagatsuma Ai! How has their relationship grown from mere acquaintances to husband and wife!?"

seems really interesting, i'll have to put this in my "start reading" list