Love Hina

Keitaro Urashima is determined to be accepted into Tokyo University, the hardest Japanese University of all to get into, because of a promise he made to a girl when he was young... a girl whose name he can't even remember. After failing to get into Tokyo U twice, he is kicked out by his parents and goes to live with his Grandmother at her hotel, but it seems it has been turned into an all girls boarding house. What's more, much to his surprise and to the tenants disgust, Keitaro is made manager of the boarding house.

Synopsis from Anime News Network