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 matters 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.
 

Keitaro Urashima's dream is to attend Tokyo University with his childhood sweetheart, a girl he hasn't seen in years. But when he fails the entrance exams, he's in danger of losing his chance for good.

Meanwhile, his job as caretaker of a girls dorm filled with gorgeous ladies keeps him more than busy. Keitaro wants to hit the books, but first he's got to see if one of the girls really is his old crush! Working together, can the two finally make the grade, or will Keitaro be seduced by the temptations that surround him?

Having now flunked her own university entrance exams, Naru can no longer tease Keitaro for his academic shortcomings. She heads off to Kyoto for a little r'n'r to clear her head ... and finds herself sharing a hotel room with Keitaro himself ... a series of catastrophic mix-ups ensues

Naru's old tutor (and secret crush!), Seta Noriyasu, drops by with his spunky 7 year-old American daughter, Sarah. Keitaro freaks at the prospect of losing Naru to her old acquaintance ... and a flying sea-turtle named Tama-chan appears to chase the girls around.

After what seems like years of studying to get into prestigious Tokyo University, Keitaro finally catches a break: the whole gang from Hinata House takes a trip to the beach for a summer of fun in the sun. Now, a seaside vacation is the perfect place to find romance - for most people, but perennial loser Keitaro is still feeling his dream girl Naru's scorn. If he doesn't find a way to win back her affections soon, he may lose her for good to his romantic rival, Seta-san.!

A year has passed since Keitaro arrived at Hinata House and things seem to be finally looking up ・he scores two tickets to go to a new amusement park and then gets a decent grade on his last college entrance practice exam ... both on the same day! And there's no better way to celebrate his improved score than to invite his cute housemate/study partner/romantic interest, Naru, to the amusement park as thanks for all of her tutoring. But though Keitaro intends for the outing to be solely a gesture of gratitude, nosy roommates quickly come to more wicked conclusions about the status of their relationship. And, despite declarations to the contrary, Naru may be beginning to see Keitaro in another light!

The secret is out ...

Keitaro's secret past comes to light - the girl of his distant memories is Mutsumi, or at least that's where Naru's deduction has led her. So now Keitaro has to start making some decisions, and what better way to make a decision between two absolutely beautiful, dynamic women than to go on a date with both of them ... at the same time. Things get stickier when Mutsumi makes herself homeless by burning her house down, landing her in temporary residence at Hinata House... staying in Naru's room ... right above Keitaro's room. Ooo, la la.

The New Year is right around the corner and the gang goes out for a celebration at a local shrine, where Keitaro, Naru, and Mutsumi all ask for good luck on the upcoming test. But with a packed house and Valentine's Day right around the corner, how much time will they spend actually studying?

Keitaro Urashima made a promise to his childhood sweetheart that he would get into Tokyo University. Well, he's failed three times and the girl of his past has been replaced with six girls in his present. Keitaro has taken the entrance exam yet again and having fallen asleep halfway through, he fears the worst. Consumed with embarrassment and shame, he flees on a journey of introspection and redemption. It's up to the crew at Hinata House to track him down and bring him back to face reality. Time is running out and Naru falls ill at a critical moment. Why is it so important to Naru that she find him?

Keitaro has finally passed the Tokyo University entrance exam but all is not happily ever after. He finally confesses his love to Naru but her reaction is not what he expected and the rest of the crew lend him their support. However, the greatest help of all may come from an unlikely source: his rival, Seta, who announces his intention to marry Haruka. This causes Naru and Keitaro to take a long look at their relationship and decide that it is time to take a big step in a new direction.
 

Naru and Keitaro take their first steps in the high-tension game of love when a power outage puts Hinata House in the dark. As old memories come to light, Naru realizes that she may be the girl from Keitaro's past after all. However, Keitaro must choose between his blossoming relationship with Naru and his desire study abroad with Seta.

Having passed his exams, Keitaro is off to America to study abroad. Months go by, and then a young girl arrives at Hinata house. Her name is Kanako, and not only is she a master of disguise, but she claims to be Keitaro's younger sister and the new manager of Hinata, to boot! When this usurper announces plans to change the dorm into an inn with the girls as her employees, it's all-out war. And what at first had appeared to be an unhealthy obsession becomes something much more threatening when Kanako reveals that she is in fact not Keitaro's sister, but his common-law wife! Naru counters with the announcement that she is the young girl with whom Keitaro made a different pact years ago. Just as things are about to get really ugly, who should arrive but our returning hero, Keitaro. Pity the poor guy ...

Keitaro's triumphant return isn't going smoothly, and Kanako's devious impersonations of Naru hardly help matters. Hinata House isn't the only thing that's changed over the months, as Keitaro seems like a new man, and theories about a blonde-haired American girl named 'Julie' abound. When Keitaro laughingly informs the girls that 'Julie' was a gorilla, Naru and Kanako resume their competition for Keitaro's attention. It's going to be an uphill battle for Kanako, since Keitaro has no memory of his promise to run Hinata House as an inn with her. Desperate to win Keitaro, Kanako tricks him into making a promise to go to Tokyo U. with her ・in a cursed room of Hinata, no less. What ensues is a wild ride of deception and seduction, complete with marauding monkeys, a railway chase, and a battle royal with the police, all culminating with an epic climax on the rugged cliffs of Northern Japan!

Naru and Keitaro have been acting lovey-dovey since they returned from their little trip and it's driving everybody crazy! But before the issue can be resolved, Keitaro's grandmother announces that she will hand over the Hinata House to him on the condition that he marries one of the girls. It's all out war when the girls attack Keitaro in order to claim him for themselves!