Its a story about an unpopular boy in highschool name Aoshima and bunch of his losser friends. Somehow he timeslip 10 year in future and find out that he is married with Wagatsuma San, the idol, most beautifull of the highschool. But the timeslip didn’t last long. But Aoshima realize that in future he is going to marry her and he determine to win Wag satsuma san's as soon as possible.
Generally its a school romcom. Besides we also see many events in this series. At the middle of the series it was turning in Harem manga but it stopped somehow.