Nagi gets Hayate to first try on a female school uniform, much to his displeasure and before he can do anything about it, Maria comes to Nagi's room and sees what is going on. Nagi and Maria then proceed to put Hayate in a full cat-girl outfit which entices Tama's animal instincts. Afterwards, Hayate runs into Klaus and initially tries to run away, but in the end Klaus' instincts take heed, and Maria must interfere. Later, Hayate and Maria play a game of pool where if Hayate loses, his debt will increase to 200 million yen.

Hayate tries to motivate Nagi to go to school finally, and offers to take her to and from school everyday from now on. Nagi reluctantly agrees and goes to school for the day, but when she comes back it turns out she forgot her notebook at school. Hayate offers to go to school late at night to bring it back and at the school gate he runs into one of the school's teachers he met earlier.

This episode, which is anime-only, takes place during the same time as episode eight and shows some other strange things that were going on in the background. A demon living inside an old video game is awoken and takes three of the student council members from Nagi's school inside the game where they must defeat her to return to the real world. Hinagiku, the student council president, arrives soon after and they go to destroy the demon, but she ends up ending it herself.

Nagi, with Hayate, Maria, and Sakuya, go to visit the head of the Sanzenin family — Mikado Sanzenin. Hayate runs into him outside, but initially believes him to be a landscaper on Mikado's estate. After Mikado reveals himself, he informs Hayate that his life is infinitely worthless while he is living to merely pay off the debt he owes Nagi. Mikado gives him a special pendant before leaving. Later, Hayate decides that he will protect Nagi from anyone that tries to hurt her, which greatly flusters Nagi.

After waking up from a dream about his childhood, Hayate talks with Maria about having dreams to live for and believes that dreams in life are very important. After revealing a childhood dream of his, Hayate gets the day off and decides to visit his old high school. There, he meets one of his old classmates, Ayumu Nishizawa, who has a crush on him. Hayate finds out that his parents took the rest of his tuition money, leaving him without a high school to go back too. After he begins to leave, Ayumu confesses her love for him, but he turns her down. Later, Ayumu gets taken into the ground of Nagi's mansion under the pretense that Hayate was being held captive by yakuza.

After turning down Ayumu, Hayate continues to wonder what she is doing while at he is at the mansion. Transfer documents arrive in the mail for Hayate to transfer into Nagi's school, and Hayate is overcome with joy to the point of crying. Hayate attempts to study the rest of the day for the exam the next day, but continuously gets interrupted by Klaus and Tama, so he does not get much sleep. The following day, Yukiji Katsura, one of the teachers at Nagi's school, has a bit of fun at Hayate's expense in order to "loosen him up" before the real exam. However, due to the physical and mental exhaustion he acquires as a result, he fails the entrance exam by one point. Yukiji is told that she must go to the Sanzenin mansion to inform Hayate, but is hesitant to do so because she believes herself to be the reason Hayate failed.

Hayate and Nagi are excited about Hayate being qualified for Nagi's school. However, Yukiji Katsura struggles to tell Hayate that he actually failed and that she was the indirect cause, having played pranks on him before the exam. She continually gets beaten by her little sister for skirting around the issue. Hayate eventually finds out and is disappointed but finds out that he actually qualified thanks to a recommendation from Maria.

Hayate goes to school early with Nagi despite her complaints. They meet a butler with a student along the way who eventually runs off with Hayate's necktie which makes Hayate and Nagi fetch a new one from home. Hayate has various discussions with Nagi and discovers that she jumped a few grades and thus is a high schooler despite her age. Hayate also discovers that Nagi used to be in a kendo club with Hinagiku but quit. Hayate decides to put Nagi back into the club when he is challenged by someone in the club.

Hayate is ready to fight. However, the boy who challenged him calls his butler to fight instead. The butler then punished the challenger for being a coward. Hinagiku then stops them and the battle starts. Hayate stands no chance against the butler since he lacks a last-minute powerful move. However, he eventually wins by using the boy who challenged him as shield calling it the "Art of Changing Bodies."

Nagi tries to gain experience after her work was rejected by a manga magazine. She believes she has no experience being lazy and staying in all the time, despite being rich and thus not having any problems living. She asks Hayate who has extraordinary experiences, but then becomes angry when Hayate tells her he once won a 'Manga Newbie Award'. She continues to gain experience while attempting to clean the house (which she messes up terribly) and by trying to serve food.

The students at Hakuō Academy go to a remote island for beach class. The butler of the beach resort named Schmidt hen Bach greets them and tries to create fun experiences for the group. However, the group of students is not having fun and want to go home, but Schmidt is not willing to let them go.

Wataru notices that Saki is acting strange so he decides to ask Hayate and Maria for help while he's picking up the cursed video that Nagi rented. It seems that Wataru forgot about Saki's seijin shiki and the people who watches the cursed video will be attacked by a giant cockroach. While Wataru is asking Nagi where he could buy a present, Hayate and Maria battle the giant cockroach. Nagi mistakes Wataru's present to be for Isumi so she sends Isumi to Wataru's house.

Hayate is searching for an ultimate attack and Maria suggests looking in the Sanzen'in library for hints. They find a book that teaches the Sanzen'in secret ultimate attack. After some training, Nagi finds out that Hayate is training for Hinagiku's sake and burns the book. Depressed, Nagi leaves the house at night where she meets Ayumu Nishizawa who challenges Nagi.

Nagi decides to take Hayate to an amusement park in her own backyard. While Hayate is roaming through the haunted house, Robot Eight, who was defeated in episode 3, appears to get revenge. After Eight's plan fails, he flees, upgrades, and breaks into Nagi's mansion for another chance for revenge.

With summer vacation coming to an end, Nagi is saddened that there won't be anymore free time to spend with Hayate. After reading a manga, Nagi decides to take Hayate fishing. While Hayate and Nagi are having a romantic time fishing (in Nagi's mind), the lord of the lake overturns their boat. Returning home, Hayate takes a bath and is joined by Tama who breaks the bath's water heater. Hayate becomes depressed because he believes he's always causing problems for Maria and attempts to fix the bath, only for it to be destroyed once again by Tama.

Shiori Makimura is sent to take over Yukiji Katsura's homeroom at Hakuō Academy after a number of failed projects at M.H.E. Corp. Yukiji Katsura is demoted to sub-homeroom teacher. In order to get her old job back, Yukiji begs Hayate to help her blackmail Shiori. Hayate refuses, but Shiori runs away crying and calls Eight after Yukiji manages to get a picture of Hayate on top of Shiori after he falls down.

Hayate is having a bad day thanks to the pendant that Nagi's grandfather gave to him. After Hayate and Wataru rescue Isumi's stole, Isumi thanks Hayate by decursing the pendant. Nagi and Wataru become depressed because they misunderstand the decursing as an act of love because they embraced. Nagi runs away from home to Wataru's video store.

Nagi is despondent over her conflict with Hayate, so she, Saki and Gilbert plan a fake kidnapping in Isumi's house underground. However, things turn bad when a Mecha programmed by Shiori goes crazy, and it is up to Hayate to go rescue Nagi and to recover his butler's status.

Hayate is running an errand for Nagi and meets Ayumu in the park. Still embarrassed about their last encounter, Hayate pretends he has amnesia and is unable to get out of the mess after Ayumu claims he is her butler. Nagi claims Hayate back and gets him to reenact experiences he faced in Nagi's mansion to recover his memory (even though he didn't lose them).

The superintendent of Hakuo Academy, decides to hold a Butler Battle Tournament to see who the strongest butler of all Hakuo is. At first, Hayate is reluctant to enter, but Nagi convinces him to do so so she can see him win. In the meantime, Hinagiku becomes a temporary butler so that she can enter the tournament to interfere with the superintendent's plans.

Hayate defeats Klaus and Tama by catching Klaus' ribbon when falling off during Klaus' Ultimate Move, leaving the whole public under the impression that he has the power to defeat opponents without even touching them. After numerous retirements from Hayate's opponents and battles through the tournament, Hayate defeats Hinagiku in the finals and fights Shion. After defeating her by discovering her weak point, the Superintendent vows to bring Hayate to her by calling her Dark Butlers League.

Saki's mother asks Saki to have a marriage meeting. Wataru becomes worried and asks Nagi on what to do. They decide to go on a marriage meeting tour to spy on Saki. The man Saki is to meet turns out to be Kyonosuke Kaoru, but they both reveal that they both have someone else they like. After a misunderstanding, Wataru decides to crash the meeting by sending Tama to kidnap Kyonosuke and to lose to Wataru on purpose. The plan is set back and Yukiji kidnaps Kyonsuke instead. In the meantime, Kirika sends Duel Butler to bring Hayate into the Dark Butlers League.

Yukiji is found murdered at a hot spring inn and Detective Nagi decides to take it upon herself to solve the mystery. After a number of wrong assumptions, Nagi blames the voice in the sky ("Ten no Koe", i.e. the narrator). Kirika sends another butler to defeat Hayate, and they have a B-Daman battle.

Sakuya visits Nagi. Nagi becomes offended when Sakuya tells her she's a brat because she has no siblings and claims she can be a better sister than Sakuya. Nagi orders Hayate to find kids that are lost on her property so she can prove it to Sakuya. Hayate comes back with Itsuki and Shunji, and Nagi plays with them while her SP looks for their parents. Sakuya suspects the kids to be thieves and catches them in the act. Afterwards, Kirika sends the third mysterious butler, Mini Yon, and he challenges Hayate to a Mini 4WD race.

Isumi is planning to come to Nagi's house but she ends up getting lost again. Fortunately for her, Sakuya finds her, but along the way, they find a man with the head of a carp who begs for their help. The carp man asks Isumi to phantom bust phantoms who are tampering with his lake.