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An unaired episode of K-ON!! released in the ninth volume of Blu-ray and DVD. The girls plan a trip abroad and go to the passport office to apply for passports.

Set before episode 23, Nodoka arrives in the clubroom with a sample of the graduation yearbook. The yearbook needs to be checked by Sawako, who is sick with a cold. Curious about what her apartment looks like, the girls decide to pay her a visit. Whilst looking through the album, they find a mysterious hand in the group photo, which turns out to be Ritsu's. Despite Sawako's objection, the girls decide to help her out around the apartment. They briefly visit Azusa, who is busy rehearsing for her freshman reception with Ui and Jun.

In order to recruit members for the next year, the girls try to come up with pitches for a new recruitment video.

Since Yui and Ritsu have siblings, the other girls wonder what kind of siblings they would have.

Although they are not supposed to be at school until graduation the next day, Yui and the others decide to hang around the club room, though they have trouble figuring out how to pass the time. They clear out their desks and visit the student council room before getting Azusa to buy them some lunch. Wanting to leave something behind after they graduate, the girls decide to record an album of their songs.

Azusa makes a cake for her friends and visits the shrine to pray for success and good fortune for them all.

The girls prepare for senior photos and college entrance exams.

The girls talk about the souvenirs they bought during the school trip to Kyoto.

As the seniors prepare for the play, Azusa worries that there has not been enough practice for the live performance. As the play goes on, the backstage crew realize they are missing Juliet's gravestone needed for the climax, but manage to borrow something from the occult club in time. After a successful play, the girls apologize to Azusa for making her worry and decide to hold an overnight practice session at school. Later that night, they browse through the closed stalls, where they find the missing gravestone, and give their thanks to the occult club. The next morning, Sawako gives the girls special Ho-kago Tea Time t-shirts for their performance.

Much to their dismay, Mio and Ritsu are respectively nominated for the roles of Romeo and Juliet in the class play. Mio has her usual problems with the pressure of being centre stage, whilst Ritsu can't act lady-like enough for her role. After not being impressed with the other girls' 'training' for them, Ritsu and Mio decide to have a cram session. Whilst doing impersonations of each other if they switched roles, they find the key to successfully acting out their parts. Noticing Mio still lacks confidence, Tsumugi arranges for her and the others to work as maids in her family's tea shop to help get over her embarrassment. Although she gains some confidence, Mio still is reluctant about being centre stage. Meanwhile, Azusa grows concerned that, with everyone rehearsing for the play, no one's preparing for the live concert.

The club room is closed for repairs, leaving the girls nowhere for practice. While trying to find a suitable location for their practicing, the girls try to come up with lyrics for the song Tsumugi wrote. Failing to find anywhere in the school to practice, they rent out a studio, but end up wasting time discussing lyrics and run out of time before they can practice, though the club room reopens the next day. The following night, Ui helps Yui write some lyrics, but ends up catching a cold, leaving Yui, who has always relied on her, to look after her instead. Realizing how important she is to her, Yui writes some lyrics dedicated to Ui, which are approved by the other club members.

When Azusa comes to the realisation that the light music club has been slacking as of late, she becomes determined to practice more. Azusa runs into Tsumugi alone in the club room and tries giving her some guitar lessons. She later is about to get a chance to practice alone with Mio, but is interrupted when Ritsu requires help from Mio and the girls end up spending the evening at Ritsu's house. The next day, Azusa runs into Yui in the club room hoping to practice, but ends up cleaning Ton's tank and helping her with understanding how to play the song Tsumugi composed, as she cannot read sheet music. Yui reminds Azusa that she is who she is, and personalizes her keychain.

After summer vacation, the girls hear about a school-wide 5000 metres marathon race, which Yui is definitely NOT interested in doing!

Ritsu and Tsumugi get into shenanigans while Nodoka helps Yui with her homework.

With the other girls studying for their exams, Azusa hangs out with Ui. Throughout the day, Azusa spaces out and has weird dreams concerning the other girls. Later, Azusa, Ui and Jun go to a swimming pool, where Jun starts to regret not joining the light music club. Afterwards, they run into Yui and the others for real and they all go to a summer festival together before Azusa, Ui and Jun lose them in a crowd. Jun mentions that she might join the light music club if they cannot get any other members by next year. At the end of the day, Azusa worries about being all alone and promises to make the upcoming school festival performance a success.

With summer vacation starting, everyone initially decides to do another training camp, but instead they decide this year to go to a summer rock festival in the mountains, which Sawako conveniently has tickets for. After following Sawako's strict survival guide, the festival starts and everyone gets into it, especially Mio, although Tsumugi and Yui become depressed when they cannot eat the foods they want. Meanwhile, the girls shortly go separate ways to listen to different bands. While Mio gets entranced by a left-handed guitarist, Sawako enjoys headbanging to a heavy metal band far from the others. After a day of music, the girls sit under the stars, listen to the bands far away, and agree to perform at the next Summer Festival.

During an unbearably hot day, the girls have trouble beating off the heat and also notice Ton shedding in its current aquarium tank. After dragging Sawako away from the air-conditioned staff room (partly to give Tsumugi a ride back to her house to get a bigger tank for Ton), the girls wonder why the club room does not have an air conditioner. After inquiring with Nodoka about it, it turns out that Ritsu never sent in a request for an air conditioner due to her never attending any student council club meetings. After pleading to the student council, the club room gets one installed. However, Yui slumps over, having forgotten that she weak to air conditioning.

After Sawako gets a call on her phone from someone in the clubroom, the girls decide to follow her. There, they find her meeting up with one of her friends, and although they are easily noticed by her, she does not alert Sawako to their position. After Sawako leaves, her friend introduces herself to the others as Christy, a guitarist from the previous light music club during Sawako's punk phase, and reveals that one of their group's other members is getting married. At the wedding, Sawako is shocked to find her old death metal band on stage with Yui as the guitarist. When Yui gets off to a nervous start, Sawako sheds off her shameful pride and takes her place on stage.

Yui decides to enter a talent show, though the others are concerned about her preparing for the show with finals approaching.

While filling in University Choice forms, Yui and Ritsu get in trouble for not being decisive enough about their future. Nodoka tells the others about how Yui somehow became friends with her after they met in kindergarten and how she has improved since joining the light music club. Mio and Ritsu later tell how they met and how Ritsu helped Mio when she was nervous about reading her award-winning essay in front of others in fourth grade. When Yui attempts to put 'musician' as her career choice only to be rejected, Nodoka cannot help but laugh. Yui asks her classmates for some advice, but still gets confused, so she just says she will do her best for now, which is still rejected.

Mio gets the feeling that someone is watching her, making her feel uneasy, though it turns out to be because she had a sticker on her hair. She is visited by Nodoka, along with a couple of members from Mio's fan club. The girls are reminded of the previous year, where Mio felt like she was being stalked by someone and went to the student council for advice. There, she met the former student council president Megumi Sogabe, who suspiciously appeared to know a lot about her and the light music club. It was soon revealed that Megumi was not only Mio's stalker, but was also president of her fan club who had wanted to see as much of her as possible before she graduated. As a graduation gift, Mio and the girls held a private concert just for her. After Megumi graduated, she passed the position of fan club president over to Nodoka. Since she had not found time to do anything for the club, Nodoka asks the light music club to hold a special tea party for them. Mio is initially embarrassed by all the skits, interviews and service she has to put up with, but warms up when she sees a slideshow of her times with the light music club. The event ends with a performance and a group photo, which Azusa sends to Megumi.

On a very rainy day, Yui gets completely soaked trying to keep her guitar from getting wet. While Yui lets her clothes dry, she temporarily wears a maid costume made by Sawako until she gets told off about it. Azusa later helps Yui maintain her guitar. When it continues to rain the next day, the others recommend Yui keep her guitar in the clubroom overnight, though it causes her to worry late at night. The following day, Yui is so overjoyed to be reunited with her guitar that she brings it to class, but Sawako tells her to put it away.

Azusa and Ui, along with their classmate Jun, spend time together while the third years are on their trip to Kyoto. Noticing that Ui would be lonely without her sister around, Jun and Azusa decide to sleepover at her house, in exchange for Azusa helping out with her underclassmen in the jazz club. After spending the night, they wake up to a rainy day. They go to an arcade where Ui hits a home run in a batting game, before Azusa is reminded that she needs to feed Ton. While in the music room, the three decide to have a jam session together. The other girls return the next day and give Azusa a keychain, one of a set that spells out 'light music club'.

The third years go on a school field trip to Kyoto. On the train there, Mio is a little annoyed at Yui's and Ritsu's childish behavior. Mio realizes that she will have to watch over both of them during the trip. After visiting various shrines and attractions, the group returns to the inn where the girls' bad habits continue to annoy Mio. The next day, they have a look around Kyoto, though Mio laments that no one wants to participate in any tourist activities. However, when they get lost on the way back to the train station along with Nodoka's group, Mio gives in to the jokey nature of the others and loosens up for the rest of the trip.

After noticing how badly she shows up in videos of the band's performances, Ritsu decides she does not want to be the drummer anymore as she does not stand out enough. She tries playing the guitar but cannot get beyond the basics. She tries the keyboard next, but only goes as far as playing with all the sound effects. The next day, Yui tries coming up with various ways to make Ritsu stand out, with no such luck. Later that night, Ritsu recalls when she first started drumming and practicing every day. After watching a DVD of The Who, she realizes that even though she is not always in the spotlight, she loves playing the drums. The next day, Tsumugi shows off a new song that Ritsu helped her come up with.

While clearing their personal belongings out of the club room, the girls find an old guitar that used to belong to Sawako. Since it had aged a bit, Sawako allows the girls to sell it and add the money to the club's budget. After visiting a home superstore to buy a storage shelf, they take the guitar to the music store where they are surprised to find it valued at ¥500,000. When Sawako inquires about the sale, Ritsu tries lying about its value, but it backfires when Sawako asks for a receipt and the club end up getting considerably less money. However, she allows the girls to buy one thing with the money. Noticing that Azusa looks a bit concerned about not having any freshmen to look after, the girls decide to get her a pet turtle named Ton.

Yui, Mio, Ritsu, and Tsumungi are all in the same class and members of the same music club. They want to bring in more members so their friend Azusa won't be the club's only member once they all graduate.