Originally posted from my blog:
For who are new to the series, check this summary of this franchise:
The story is a comedy that centers on Keitaro and his attempts to fulfill a childhood promise that he made with a girl to enter Tokyo University together. After failing the entrance exam twice and his parents no longer willing to support him, he goes to stay at his grandmother's hotel, only to find that it has been converted to a female-only apartments. He is about to be kicked out by the girls, when his aunt announced that his grandmother has given him the titles of the apartments, and he stays on as the manager of the family-owned girls' dorm Hinata House. Now he has to balance his new responsibilities with his attempts to pass the university entrance exam.