Keitaro Urashima promised a girl when he was young that they would meet up again at Tokyo University in the future. Sadly, in the National Practice Exam, Keitaro ranked 27th from the bottom. Knowing his grandmother owned a hotel, Keitaro intended to stay there while continuing his studies for Tokyo U, only to find out the hotel had long been transformed into an all-girls dormitory. Through an odd twist of fate, Keitaro eventually became the manager of the dorm, beginning his life of living with 5 other girls.

Keitaro needs some time to evaluate himself and his goals, so he goes onto a trip with Seta to attempt the life of an archaeologist. However, not all is safe at the Hinata Inn while he is gone. A woman claiming to be Keitaro's sister comes and claims right to being the manager of the inn. Life gets complicated when Keitaro returns, and attempts to deal with his sister of yesteryear. (Source: Anime News Network)

When Keitaro Urashima fails his entrance exams to get into Tokyo University for the second time, he's officially an unemployed and uneducated slacker. To make things worse, his parents have kicked him out of his house. Fortunately, his grandmother owns the fabulous Hinata Lodge and has agreed to take Keitaro in as caretaker. What he doesn't know is that the lodge is actually a girls' dorm and he's the only guy around! Most guys would kill to live with five sexy ladies, but if Keitaro's not careful, this job will kill him.
 
(Source: Kodansha Comics)

As another round of preliminary tests approach for Keitaro, so does Christmas. And as the first Christmas of the millenium, there is a rumor that if one confesses his love on this special eve it will come true. Keitaro has decided what he needs to do on this Christmas eve, but being a retaker can he afford taking attention away from the tests on the same day... 
The Winter has begun in Hinata. X-mas is coming up. There are rumors about this special christmas eve: If someone is going to confess his love on this christmas eve, any wish will come true. Keitaro decides to confess his love to Naru. But he isn't the only one confessing on this christmas eve...
 
(Source: Anime News Network)

The tests have come, and Keitaro can only hope to succeed. However, in the final stretch, he fails miserably and daydreams through the test. Assuming that he has failed, he runs away, so the rest of the cast hunts him down on a remote desert island to bring him back. 
The Toudai entrance exams have finally come (again) for Keitaro. With all his confidence Keitaro sits for the paper, but ends up falling asleep and dreaming about Narusegawa. Waking up with barely any time to complete the paper, Keitaro thinks he will fail the paper and tries to escape from Hinata Lodge and forget all the memories with it. By a stroke of luck he meets Seta, but ends up in a faraway island with the whole cast trying to look for him.
 
(Source: Anime News Network)

Out of nowhere, Motoko's sister appears and is ready to pass on the dojo. However, Motoko is still not quite as strong as her sister and when her sister finds out about this, she gives Motoko an ultimatum: Motoko must beat her sister or marry Keitaro! 
 
(Source: Wikipedia)

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