“Endless Eight” “Endoresu Eito” (エンドレスエイト)

Somehow summer vacation has repeated like the previous episode. Kyon is wracked by a sense of déjà vu. Itsuki is likewise troubled, while Yuki seems even more detached than usual. They finally figure out that Haruhi has put the last two weeks of August into an infinite loop because she refuses to let summer end. They find out that the loop has repeated 15,498 times with slight variations, but none of them can devise anything to stop the cycle from repeating. Upon their last meeting in a restaurant on last day, Kyon calls out after Haruhi in a last-ditch attempt to stop her from leaving, but fails to think of anything he can do, and she leaves. As the last day of vacation arrives, Kyon, resigned to the loop repeating itself, goes to bed without finishing his summer homework.

“Light Music!” “Keion!” (軽音!)

Yui is still sick from her cold, which is possibly attributed to her wearing a short yukata for too long. As the band tries to make do with Azusa as lead guitarist, Yui supposedly shows up over with her cold. However, her playing is too perfect and when she accidentally messes up her honorifics, it is revealed that she is actually Ui, who had managed to play after a few days practice. Yui appears, but is still in no condition to play, so Mio tells her to stay home and recuperate until the day of the live performance. Yui eventually makes it in time, but forgets her guitar at home, so Sawako fills in for her while she goes to get it. Yui returns in time for the second song and the performance goes well, and the band even does an encore.

“Endless Eight” “Endoresu Eito” (エンドレスエイト)

Kyon’s relaxing summer vacation is interrupted by a sudden phone call. It appears that Haruhi wants the SOS Brigade to join her in summer activities and unfortunately for Kyon, Haruhi has a long list of activities she wants to try out. As such, the group is taken on a whirlwind tour of summer activities for the next two weeks. They relax at the swimming pool, attend the upcoming summer festival, shoot off fireworks, hunt for bugs, take on a part-time job, stargaze, and play baseball at a batting range. They also watch a fireworks display, compete in a fishing tournament, travel through a cemetery, watch a blockbuster, go to the beach, go bowling, and sing karaoke. Finally, having gone through Haruhi’s entire list, the last day of August arrives. Though Kyon tries to make up for his lost time by doing his neglected summer homework, he eventually gives in to distraction and goes to bed without finishing it.

“Crisis!” “Pinchi!” (ピンチ!)

When Ritsu is reminded by Nodoka to fill in the stage-use application form in advance, the band members notice they do not have a name yet. Azusa inspects the rust on Yui’s guitar strings, and it becomes apparent that Yui has never given her guitar maintenance before. They take it to the guitar shop, where Mio is entranced by rare left-handed bass guitars. After the guitar is repaired Yui realizes that she has to pay for the maintenance service, but has not brought any money with her. Though Tsumugi offers to pay instead, the shopkeeper, refusing to take money from her, tells her to consider it a free service. Later, Ritsu starts to become jealous of Mio spending time with Nodoka and begins to fall out with her. She ends up with a fever, so Mio visits and smooths things over, joined later by the other girls. Back at school, a recovered Ritsu gets in trouble for failing to turn in the application form on time, but Nodoka backs her up in front of the student council. Since the girls are unable to decide on a name for the band, Sawako makes an executive decision and assigns the name “After School Tea Time” to the band. Yui unfortunately ends up catching Ritsu’s cold.

“Remote Island Syndrome (Part Two)” “Kotō Shōkōgun (Kōhen)” (孤島症候群(後編))

The SOS Brigade attempt to find clues to the murder of Keiichi. Yutaka Tamaru is initially suspect due to having been seen leaving the island the previous day before the storm hit. Kyon and Haruhi head outside during the storm, but find nothing, not even the boat. While drying off inside a cave, Haruhi comes to a startling conclusion about the murder, though there was a flaw to her story. They return to the villa and set to devising a plan to solve the mystery, but Haruhi later gives up trying to crack this case. Itsuki tells Kyon another theory to how the murder occurred, which leads the latter to prevent this from being known to the others. It is soon revealed that the murder was just a hoax to spur up excitement. Haruhi explains how she knew that the murder was faked. As the SOS Brigade set sail from the island, Itsuki says to Kyon that this was a plan to get Haruhi to keep her mind free from strange thoughts.

“Another Training Camp!” “Mata Gasshuku!” (また合宿!)

Azusa and Ui hang out together for the first time for lunch, joined later by a stealthy Ritsu. Yui and Ritsu invite Sawako to join their next training camp, but she appears uninterested. The gang arrive at an even larger villa than last year, though Tsumugi apologetically points out that it is still not as large as the one she had desired. Yui and Ritsu want to play and Mio and Azusa want to practice, but Tsumugi casts the deciding vote in favor of playing. Although Azusa objects, she ends up having the most fun anyway, even getting sunburned in the process. After practice, dinner, and fireworks, Ritsu suggests a test of courage, and Mio and Azusa are shocked by the sudden appearance of Sawako. In the middle of the night, Azusa discovers Yui practicing the guitar, and they bond. Azusa meets up with Ui again, saying that despite not practicing much, she enjoyed the trip as she got to know more about the group.

“Remote Island Syndrome (Part One)” “Kotō Shōkōgun (Zenpen)” (孤島症候群(前編))

A supposed distant relative of Itsuki, later recognized as Keiichi Tamaru, allows the SOS Brigade, along with Kyon’s sister, to stay at his newly built island villa. On their first day there, they enjoy the facilities and play outside on the beach, but are soon drawn inside by the arrival of a storm. While waiting for the storm to pass, Haruhi and her friends play games indoors and have fun together. Later, Keiichi disappears, and everyone starts searching for him. Ultimately, the SOS Brigade members find Keiichi dead in his room.

“New Club Member!” “Shinnyū Buin!” (新入部員!)

Azusa officially joins the club, but is shocked to find everyone drinking tea and eating cake instead of practicing. She yells at them when Sawako tells her off for actually practicing, but Yui manages to calm her down with a surprising tactic. Despite her objections, Azusa finds herself weak against Tsumugi’s tea and cakes. Yui herself is rather shocked that Azusa plays guitar much better than herself. Sawako brings a pair of cat ears for Azusa to wear, much to Azusa’s discomfort, leading Yui to give her the nickname “Azu-nyan”, as “nyan” is the Japanese counterpart of “meow”. Noticing that Azusa is a bit upset, Mio encourages the band to practice more, but the group quickly reverts to its lazy state. Azusa then becomes frustrated, wondering as to why the band members she admired at the live performance behave as they do. After Azusa expresses her frustration, Mio explains to her that she stays in the band because they have fun performing together and because they like each other, thus convincing Azusa to stay.

“Mystérique Sign” “Misuterikku Sain” (ミステリックサイン)

The website of the SOS Brigade website has been created, but it is composed of little more than the club logo. Coincidentally, the SOS Brigade gets their first case after the website goes up, in which the Computer Research Society president has been reported missing by Emiri Kimidori, who falsely claims to be his girlfriend. Upon going to his apartment, the club members see that he is nowhere to be found, and nothing seems too out of the ordinary on the surface. However, after Haruhi leaves, the others return back to the apartment where they enter a sealed reality somehow created by the president, trapped inside a data entity known as a camel cricket. Kyon and Mikuru watches as Yuki and Itsuki defeat the camel cricket, thereby recovering the president. It is later realized that the club logo that Haruhi had drawn was the catalyst for the sealed reality.

“Freshman Reception!” “Shinkan!” (新歓!)

The second year of high school begins. Ui Hirasawa enters the Sakuragaoka High School along with a girl named Azusa Nakano. The Light Music Club tries to gather new members by all means.

“Bamboo Leaf Rhapsody” “Sasa no Ha Rapusodi” (笹の葉ラプソディ)

On Tanabata, Kyon time travels with Mikuru on a mission exactly three years in the past. Kyon is guided by the future Mikuru to carry younger self, that she put to sleep, and is told to help someone. He finds a young Haruhi sneaking into her junior high school, and is forced to assist her, though keeping his name anonymous. After helping her draw strange symbols on the school athletics grounds, Haruhi questions him on the existence of strange beings, and Kyon suggests that they might exist because he knows someone like her at his school. After Haruhi leaves, Kyon wakes up Mikuru, only to find that she misplaces her time traveling device. They go to see Yuki, who helps them return to their proper time. Kyon wonders if he was the one who inspired Haruhi to attend his high school and start searching for strange beings.

“Christmas!” “Kurisumasu!” (クリスマス!)

Yui’s sister Ui Hirasawa remembers how Yui once attempted to give her a white Christmas when they were little, by putting pillow-stuffing on the tree outside. Ritsu decides to hold a Christmas party for the club, and while her initial plans of holding it at Tsumugi’s house fail, they eventually decide to have it at Yui’s house while Yui’s parents are on vacation. Yui’s friend Nodoka Manabe also gets an invitation. The girls decide to hold a gift exchange at the party, and go shopping for various gifts. Ui prepares a lovely Christmas dinner for the group, which gets a little out of hand when Sawako shows up out of nowhere. After the gift exchange, Yui and Ui end up giving each other just the right warm accessories for the winter. After the rest of the group leaves, snow falls and Yui and Ui decide to sleep together, though, unfortunately for Ui, Yui ends up hogging the sheets. In the New Year, the club decides to visit the shrine to make their New Year wishes.

“The Boredom of Haruhi Suzumiya” “Suzumiya Haruhi no Taikutsu” (涼宮ハルヒの退屈)

Haruhi has once again become bored. In an effort to alleviate some of this stagnation, Haruhi enters the SOS Brigade into a baseball tournament. Due to a lack of players, Tsuruya, Taniguchi, Kunikida, and Kyon’s sister are recruited into the team. However, the team is hopelessly inept, and if they lose, Haruhi might destroy the world. To remedy the situation, Yuki uses her powers to alter the course of the game.

“School Festival!” “Gakuensai!” (学園祭!)

It’s the day of the school festival. The club performs for the first time.

“The Melancholy of Haruhi Suzumiya Part Six” “Suzumiya Haruhi no Yūutsu VI” (涼宮ハルヒの憂鬱VI)

One night, Haruhi’s power is activated without her knowing, and both she and Kyon become trapped in a sealed reality at their school. As Haruhi goes out on her own, Kyon is met by Itsuki, who tell Kyon that Haruhi might have created this world to be alone with Kyon. Yuki contacts Kyon via computer and gives the hint of Sleeping Beauty as a means to return back. Kyon and Haruhi are forced to evacuate when blue giant entities appear and begin to destroy the school and the surrounding area. Using hints provided by Yuki and Mikuru beforehand in order to defuse the situation and escape, Kyon kisses Haruhi as he expresses his desire to return to the old world. It remains unknown whether or not this world is the old one or a new one, however the three other members are glad to see Kyon back again.

“Advisor!” “Komon!” (顧問!)

The Light Music Club does not have an adviser yet. Ritsu Tainaka blackmails the music teacher Sawako Yamanaka so she will be their club’s supervisor. Mio Akiyama writes a song for the school festival but they can’t decide who will be the band’s vocalist.

“The Melancholy of Haruhi Suzumiya Part Five” “Suzumiya Haruhi no Yūutsu V” (涼宮ハルヒの憂鬱V)

Kyon is dragged into helping Haruhi attempting to investigate what happened to Ryoko’s strange disappearance without notice. After a fruitless search, Haruhi tells Kyon about her earlier years, and how she changed from an ordinary girl into her present state. Later that day, Itsuki tells Kyon about the theory of the anthropic principle correlating with Haruhi, and he believes that Kyon is the reason why Haruhi was able to wish of such extraterrestrial beings to exist. Itsuki brings Kyon into a sealed reality, where the latter watches the espers destroy a blue giant entity subconsciously created by Haruhi. When returning to his house, Kyon is told by Itsuki to look after Haruhi.

“Training Camp!” “Gasshuku!” (合宿!)

The girls go to a training camp in a beachside villa owned by Tsumugi Kotobuki family after Mio Akiyama became inspired by a tape recording of the previous Light Music Club members’ performance.

“The Melancholy of Haruhi Suzumiya Part Four” “Suzumiya Haruhi no Yūutsu IV” (涼宮ハルヒの憂鬱IV)

Haruhi is visibly bored and is not her usual energetic self. Ryoko Asakura, the class president, is concerned and asks Kyon to help her. Kyon later finds a mysterious letter in his locker, which directs to come to a classroom, where Ryoko confronts him. Revealed to also be an alien, Ryoko attempts to kill Kyon in order to provoke a reaction from Haruhi, but is stopped by Yuki. Later, Kyon meets Mikuru’s older self that had traveled from the future, who reveals that Snow White is the clue essential to his future. Ryoko was reported to never have transferred into the high school, much to Haruhi’s suspicion.

“Cram Session!” “Tokkun!” (特訓!)

Yui Hirasawa must pass on the midterm exams or else she won’t be allowed to stay in the Light Music Club anymore. The others help Yui study to pass her second chance.