K-ON!

What is K-ON! about?

K-ON! is a TV anime series of 13 episodes animated by Kyoto Animation, adapted from a manga. It aired from April 3, 2009 to June 26, 2009. AniList classifies it as comedy, music and slice of life.

Synopsis from AniList, which credits MAL Rewrite. The summary above it is written by FreeAnime.xyz from AniList's data.

Themes AniList users associate with it: Cute Girls Doing Cute Things, School Club, Band, Primarily Female Cast, Female Protagonist, School, Primarily Teen Cast, Iyashikei, Episodic, Rock Music.

Main characters

Characters AniList lists in a main role, with spoiler-free notes.

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  Yui Hirasawa 平沢唯

  Main character

  Yui Hirasawa is one of the 5 main characters in K-ON!. She's also the main protagonist. She is the air-headed lead guitarist and vocalist of the band Ho-kago Tea Time.

  Japanese voice: Aki Toyosaki

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  Mio Akiyama 秋山澪

  Main character

  Mio Akiyama is one of the five main characters in K-ON! She is a passionate and technical left-handed musician and writer who serves as the bassist, second vocalist and main lyricist of the band Ho-kago Tea Time. She is a kind and warm girl, albeit very shy and sensitive.

  Japanese voice: Youko Hikasa

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  Ritsu Tainaka 田井中律

  Main character

  Ritsu Tainaka, called Ricchan by Tsumugi Kotobuki and Yui Hirasawa, is one of the 5 main characters in K-ON!. She is the self-appointed president of the Light Music Club and the drummer of the band Ho-kago Tea Time.

  Japanese voice: Satomi Satou

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  Tsumugi Kotobuki 琴吹紬

  Main character

  Tsumugi Kotobuki, otherwise known as Mugi is one of the 5 main characters in K-ON! She is a wealthy, cheery, cute girl with a gentle personality who plays the keyboard and is the main musical composer in the band Ho-kago Tea Time.

  Japanese voice: Minako Kotobuki

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  Azusa Nakano 中野梓

  Main character

  Azusa Nakano, nicknamed "Azu-nyan" by Yui Hirasawa, is a main character in the K-ON! series. She is a second year student at Sakuragaoka High School. She decided to join the Light Music Club after seeing the band's performance in the school festival, and thus became Ho-kago Tea Time's second guitarist.

  Japanese voice: Ayana Taketatsu

Supporting characters

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  Sawako Yamanaka 山中さわ子

  Supporting character

  Sawako is the adviser for the wind instrument club at Yui's school. An alumna of the school and a former member of the light music club, she does not want people to know she was formerly a member of a heavy metal band, thus she covers up by being mild and gentle to her co-workers and especially to students.

  Japanese voice: Asami Sanada

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  Nodoka Manabe 真鍋和

  Supporting character

  Nodoka is Yui's childhood friend and confidant who is a member of the school's student council. As a normal, well-mannered and intelligent girl, she is generally taken aback by the light music club's odd behavior, and easily gets annoyed with Ritsu whenever she forgets to fill in the club's application forms.

  Japanese voice: Chika Fujitou

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  Ui Hirasawa 平沢憂

  Supporting character

  Ui is Yui's younger sister, who begins the story as a third-year junior high school student, but later enters Yui's high school the following year in the same class as Azusa.

  Japanese voice: Madoka Yonezawa

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  Megumi Sokabe 曽我部恵

  Supporting character

  Megumi was the president of the student council before Nodoka succeeds her in her third year, and she is also the president of Mio's fan club. She stalks Mio during her last few days in high school because she wanted to see Mio one more time. The band offers her a song as a graduation gift.

  Japanese voice: Asumi Kodama

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  Satoshi Tainaka 田井中聡

  Supporting character

  Satoshi is Ritsu's younger brother. He appears when Ritsu is walking home with him from the movies. He then ventures of with a friend from school he saw on the way home. He seems to respect his sister Ritsu but still acts like a normal boy.

  Japanese voice: Mika Itou

• 

  Jun Suzuki 鈴木純

  Supporting character

  Jun is Azusa's and Ui's classmate who often hangs out with the latter. Jun is generally a playful and easygoing girl, but she is sometimes rude without realizing it, compelling Azusa to reprimand her. Ui tries to get her to join the light music club but ultimately fails due to a strange visit to the club room.

  Japanese voice: Yoriko Nagata

• 

  Yui to Ui no Haha 唯・憂の母

  Supporting character

  Yui and Ui's mother. She is usually away with their father so Ui is left to do all of the chores and take care of Yui.

  Japanese voice: Rio Natsuki

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  Yui to Ui no Papa 唯・憂の父

  Supporting character

  Yui and Ui's father.

  Japanese voice: Riki Kitazawa

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  Youko Sasaki 佐々木洋子

  Supporting character

  Youko Sasaki is one of the students from Class 3-2 She has been Yui's classmate since their first year in high school. She is a gentle and quiet girl, but when she becomes fixated on something, the world around her disappears. She is a bona fide member of the Mio Fan Club and also the only one from Class 3-2.

  Japanese voice: Yura Hasegawa

• 

  Azu-nyan 2-gou あずにゃん2号

  Supporting character

  Azu-nyan 2 is a cat that belongs to Jun Suzuki seen in Winter Days!. Her real name is not known, however, Azusa Nakano gave her the current nickname as an allusion to her own nickname (Azu-nyan).

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  Hitomi Hoshino 星野ひとみ

  Supporting character

  Hitomi Hoshino is an anime-only character that mainly appears in the episode Winter Days!. She is a worker at a fast food restaurant, where she helped Tsumugi Kotobuki as her senior.

  Japanese voice: Yui Shouji

• 

  Della デラ

  Supporting character

  Della (stage name) is Death Devil's bassist and a former member of the Sakuragaoka High School's Light Music Club. Like her friends, Della highly cherishes her time within the Light Music Club and later their band Death Devil.