After deciding to take the semester off from Tokyo U, Keitaro goes to America with Seta to explore different archaeology sites. Kanako, Keitaro's step sister, comes to the Hinata apartments and appoints herself as the new landlord in Keitaro's absence, much to the annoyance of all the residents. Kanako makes many new rules, one which the residents try to break in order to find her weakness. What they didn't know was that it had to do with a certain promise Keitaro made with his "little sister."
After returning from overseas with Seta, Keitaro brings gifts for all the Hinata residents. After seeing Kanako, Keitaro thinks she's a new resident, but then recognizes her as the little girl who followed him. Kanako plans to get her and Keitaro alone, sending the dorm residents on "errands" that turn out to be fake. Tension rises a lot between Kanako and Naru. Keitaro asks Naru to meet him at the abandoned annex. Since the legend of the annex says if a couple stays there over night, they'll li
Things are a little strange after Kanako, Keitaro, and Naru were in the annex. Both seem to have dreams with Moe as guide showing their true feelings and past promises. Naru still can't show her feelings for Keitaro, causing Shinobu, Matoko, and Kanako in particular much frustration. Kanako tries to find out both of their feelings using her usual method of disguise. To her disappointment, Naru seems too confused. Both of them are in love of course, however Naru's too afraid to face Shinobu and M
After finding out that Keitaro was actually a prep school student and not a Tokyo U student, the other resident were disappointed that he lied to them. Even so, they still let Keitaro stay as manager as long as he does work around the apartment. When Keitaro sneaks a peak at Naru's diary and finds out about a promise that apparently she made many years ago to go to Tokyo U, he starts to think that Naru could be his promise girl. However when Naru walks in and saw Keitaro was reading her diary, s
After Keitaro and Naru were embarrassed about failing the entrance exams, Keitaro for the third time and Naru for the first time, they both decided to go their separate ways and go on a short vacation to Kyoto. They are oblivious to the fact that they are sharing the same seat on the train due to the fact that both their glasses are broken. They spend a day together and both think they have found an ideal match. Then they were forced into sharing a hotel room and they finally get their glasses b
When the residents of the Hinata Apartments saw Keitaro on TV, they decide to mount a rescue mission. But they get completely sidetrack because nobody seems to know where they are. Meanwhile, Keitaro and Naru continue their shared holiday, much to Naru's disgust. They meet up with Mutsumi Otohime, the girl Keitaro ran into at their second exam, who is having difficulty in getting home to Okinawa. Keitaro offers to accompany Mutsumi, and Naru eventually tags along, but because of Mutsumi's bad se
Su has created a new device, Virtual-Kun, which allows you to see what a person desires in their heart. When used on Keitaro, it reveals his affection for Naru, and his intention to take her on a date to a newly-opened amusement park. But when one of Naru's classmates, the calculating Kentaro, offers her the same deal, the two men end up in a competition for her affection.
During meditation, Motoko enters a dreamworld where everyone is living in an RPG. Keitaro is a knight on a quest to save Naru from the Dragon King and the silliness of it all turns off Motoko. But as she continues to meditate further, she finds a lesson in the dream.
The monthly rent is due in Hinata House, but since Keitaro is too sleepy to pay attention, the money disappears. It falls to Kitsune and Su, the only ones with a steadfast alibi, to discover who the thief is.
While trying to win Naru's favor (once again), Kentaro is ambushed by a girl who looks like an older version of Su. Keitaro and Naru struggle to prove Su's innocence, especially with every other male pointing the finger.
Naru becomes a celebrity all across Japan as an idol and this, of course, leads to Keitaro worrying about her studies. He begins to believe that Naru no longer cares about getting into Tokyo University and becomes incredibly depressed.
Motoko has a secret fear: turtles. So when Naru's pet Tama-chan falls in with the laundry, Motoko finds herself asking everyone for clothes, even Keitaro! The only problem is, without her own clothes, she cannot summon her ki, and therefore has no skill with the sword. And when Su's robotic Tama-chan comes crashing towards Hinata House, the residents definitely need a swordswoman.
After spying on one of Keitaro's failed attempts to kiss Naru, Shinobu ends up worrying who her first kiss will be with. Her mind says Keitaro, but with Su added into the equation, who knows who it will be?
There is a financial crisis at Hinata House: if the residents don't come up with 67,000 yen in three days, the utility companies will cut off all services. Keitaro ends up working for one of Tokyo U's scientists, not to mention his hyperactive daughter, but doesn't know about the old connection between this man and Naru.
Keitaro is forced to look after Seta's adoptive daughter Sarah while the archaeologist is on a dig. A series of events leads them to the darker part of Hinata House, where everyone makes a startling discovery.
Haruka is opening a tea house by the beach over the summer, and the residents have to put on a play to draw in customers. But when Su destroys the main building, Seta appears with an alternate venue. The price for this venue, however, is a change in the castings.
Shirai and Haitani offer to help Keitaro earn Naru's heart, with a scary boat ride that drives her into his arms. Their plans are dashed, however, when a real ghost seizes Naru, and Motoko has to fight on her behalf.
Just before the residents go back from their summer break, they attend the Summer festival in the local town, dressed in traditional outfits. Kitsune, however, seems determined to force Naru and Seta away from one another for their own good. Could she have an ulterior motive?
A man who happens to look exactly like Keitaro when he wears glasses appears and is later found out to be from Kaolla's home country. He is here to marry Kaolla but she decides she isn't quite ready yet, but tradition says she must.
Keitaro discovers a doll that can move on its own. Everyone is amazed by it but Keitaro and Mutsumi seem to be able to hear it talk also. Keitaro finds out from the doll that his great grandfather promised to fix its legs but never did and being the good guy he is, Keitaro decides to fulfill his ancestor's promise with the help of the girls, of course.
Naru and Keitaro decide to go out to celebrate the latest grades and while both are wondering whether it's a date or not, a mysterious little girl appears.Mutsumi also states that she is trying for Tokyo U because of a promise she made while she was still a little girl, but can't remember the name or face of the boy, hinting to the fact that she might be the girl that Keitaro made the promise to.
Mei is Naru's stepsister and hopes to take Naru back home. To accomplish this, she decides she has to hook Keitaro up with Mutsumi and it is in this episode that Naru finds out something shocking.
Naru now wonders what she should do with her newfound knowledge and it seems like Keitaro is going to be returning home since his grandma has returned to reclaim the inn. To add more to the mess, it doesn't look like Keitaro's studies are going to be enough to help him into Tokyo University.
Everyone has to leave Hinata House for a day because the inn is undergoing repairs and renovations. It also becomes apparent that Keitaro won't be coming back to Hinata Inn and Naru has completely given up on Keitaro. Who will Keitaro decide to be his soulmate, Naru or Mutsumi?