My Friend's Little Sister Has It In for Me!

My Friend's Little Sister Has It In for Me!
First light novel volume cover featuring Iroha Kohinata
友達の妹が俺にだけウザい
(Tomodachi no Imōto ga Ore ni Dake Uzai)
GenreRomantic comedy[1]
Light novel
Written byGhost Mikawa
Illustrated byTomari
Published bySB Creative
English publisher
ImprintGA Bunko
Original runApril 15, 2019 – present
Volumes11
Manga
Written byGhost Mikawa
Illustrated byHira Hiraoka
Published bySquare Enix
English publisher
  • NA: Comikey
    Square Enix
MagazineManga Up!
Original runDecember 13, 2019 – present
Volumes10
Anime television series
Directed byKazuomi Koga
Produced by
  • Shintarou Yoshitake
  • Kazuo Tsutsui
  • Koutarou Asanuma
  • Natsuko Nagase
  • Kazuo Oonuki
  • Tomoyuki Oowada
  • Airi Sawada
  • Eimi Nakagawa
  • Shintarou Shiozawa
Written byTouko Machida
Music by
  • Tsugumi Tanaka
  • Kaho Sawada
  • Kanade Sakuma
  • Hanae Nakamura
StudioBlade
Licensed byCrunchyroll
Original networkANN (TV Asahi), BS11, AT-X
Original run October 5, 2025 – December 21, 2025
Episodes12

My Friend's Little Sister Has It In for Me! (友達の妹が俺にだけウザい, Tomodachi no Imōto ga Ore ni Dake Uzai), or ImoUza!, is a Japanese light novel series written by Ghost Mikawa and illustrated by Tomari. The series began publication by SB Creative under their GA Bunko imprint in April 2019. The light novel is licensed in North America by J-Novel Club. A manga adaptation by Hira Hiraoka began serialization online in December 2019. An anime television series adaptation produced by Blade aired from October to December 2025.

Plot

The series follows Akiteru Ōboshi, an ordinary student who is best friends with his classmate Ozuma Kohinata. Iroha, Ozuma's younger sister, often hangs out at his house and acts annoying towards him, a contrast to her in-school persona as a kind and diligent honor student. One day, he is asked by his uncle to start a relationship with his cousin Mashiro Tsukinomori in exchange for him providing support for his game development group, which they call the 5th Floor Alliance. Meanwhile, Iroha aims to be a professional voice actress, providing the voices for the 5th Floor Alliance's work, but does so in secret due to her family's disapproval of her interests.

Characters

Main characters

Akiteru Ooboshi (大星 明照, Ooboshi Akiteru)
Voiced by: Haruki Ishiya[2]
Akiteru is a second year high school student. In the series, Akiteru calls himself a well-rounded average student but still has a hidden side to him.
Iroha Kohinata (小日向 彩羽, Kohinata Iroha)
Voiced by: Sayumi Suzushiro[2]
Iroha is Akiteru's best friend's younger sister. In the story, Iroha is a bright, kind, and beautiful honor student. She is described as an excitable person who also acts clingy towards Akiteru. She aims to become a voice actress. When she was in junior high school, she was on bad terms with Ozuma and was a loner, with only her dream of becoming a voice actress pushing her forward, despite her mother's disapproval. However, after meeting Akiteru, she opens up and gets into voice acting.
Mashiro Tsukinomori (月ノ森 真白, Tsukinomori Mashiro)
Voiced by: Tomori Kusunoki[2]
Mashiro is a second year high school student, classmate and cousin of Akiteru. She is childhood friends with Akiteru and often played with him when they were younger. In the story, Mashiro is described as a gentle person when meeting strangers with a cold demeanor towards Akiteru. She speaks in the third-person. She is also a popular novelist who writes under the pen name Namako Makigai (巻貝 なまこ, Makigai Namako).
Ozuma Kohinata (小日向 乙馬, Kohinata Ozuma)
Voiced by: Soma Saito[2]
Ozuma is a second year high school student and Iroha's older brother. In the story, Ozuma is a kind and caring person. He is described as "handsome like a prince" and is a genius programmer. Ozuma is Akiteru's only friend and has absolute faith in Akiteru due to some past events.
Sumire Kageishi (影石 菫, Kageishi Sumire)
Voiced by: Kana Hanazawa[2]
Sumire is Akiteru's mathematics and homeroom teacher. She is described as a ruthless guidance and has a poisonous tongue. She secretly works as an illustrator under the pen name Shikibu Murasaki (紫 式部, Murasaki Shikibu)
Reiku Otoi (音井 麗紅, Otoi Reiku)
Voiced by: Azusa Tadokoro
Reiku is a second year high school student. She is a sound engineer.
Midori Kageishi (影石 翠, Kageishi Midori)
Voiced by: Reina Kondō[3]
Midori is Sumire's little sister and the President of the Drama Club.
Kanaria Kiraboshi (綺羅星 金糸雀, Kiraboshi Kanaria)
Voiced by: Yukari Tamura
An idol and a famous editor at UZA Publishing, whose real name is Kana Hoshino (Hoshino Kana).
Sasara Tomosaka (友坂 茶々良, Tomosaka Sasara)
Voiced by: Ikumi Hasegawa
A first year high school student. She is an influencer on Pinstagram.

Supporting characters

Makoto Tsukinomori (月ノ森 真琴, Tsukinomori Makoto)
Voiced by: Katsuyuki Konishi
Mashiro's father and Akiteru's uncle. He is the president of the large entertainment enterprise Honeyplace Works.
Otoha Kohinata (小日向 乙羽, Kohinata Otoha)
Voiced by: Atsuko Tanaka (drama CD)
Otoha is the mother of both Ozuma and Iroha.
Kou Kageishi (影石 鉱, Kageishi Kou)
Sumire and Midori's Grandfather.
Mizuki Tsukinomori (月ノ森 海月, Tsukinomori Mizuki)
Mashiro's mother.
Asagi Tachibana (橘 浅黄, Tachibana Asagi)
Voiced by: Sayaka Kikuchi

Media

Light novels

The light novel series is written by Ghost Mikawa and features illustrations by Tomari. It is published by SB Creative under their GA Bunko imprint, with the first volume being released on April 15, 2019; eleven volumes have been released as of March 2025.[4] The series is licensed in English by J-Novel Club.[5]

No. Original release date Original ISBN English release date English ISBN
1April 12, 2019[6]978-4-8156-0187-4February 10, 2021 (digital)[7]
December 7, 2021 (print)[8]		978-1-71-832680-4
2July 12, 2019[9]978-4-8156-0277-2April 23, 2021 (digital)[10]
February 1, 2022 (print)[11]		978-1-71-832681-1
3November 14, 2019[12]978-4-8156-0427-1July 9, 2021 (digital)[13]
March 29, 2022 (print)[14]		978-1-71-832682-8
4March 13, 2020[15][16]978-4-8156-0480-6
978-4-8156-0479-0 (SE)		October 29, 2021 (digital)[17]
May 24, 2022 (print)[18]		978-1-71-832683-5
5August 6, 2020[19]978-4-8156-0623-7January 14, 2022 (digital)[20]
August 2, 2022 (print)[21]		978-1-71-832684-2
6December 10, 2020[22][23]978-4-8156-0781-4
978-4-8156-0780-7 (SE)		April 15, 2022 (digital)[24]
January 17, 2023 (print)[25]		978-1-71-832685-9
7March 12, 2021[26][27]978-4-8156-0783-8
978-4-8156-0782-1 (SE)		July 8, 2022 (digital)[28]
April 18, 2023 (print)[29]		978-1-71-832638-5
8August 12, 2021[30][31]978-4-8156-1014-2
978-4-8156-1013-5 (SE)		October 7, 2022 (digital)[32]
August 8, 2023 (print)[33]		978-1-71-832640-8
9January 15, 2022[34][35]978-4-8156-1227-6
978-4-8156-1226-9 (SE)		January 12, 2023 (digital)[36]
June 11, 2024 (print)[37]		978-1-71-832688-0
10October 15, 2022[38][39]978-4-8156-1600-7
978-4-8156-1599-4 (SE)		August 4, 2023 (digital)[40]
December 10, 2024 (print)[41]		978-1-71-832644-6
11March 15, 2025[42]978-4-8156-1912-1December 5, 2025 (digital)[43]978-1-71-832646-0

Manga

A manga adaptation by Hira Hiraoka began serialization in Square Enix's Manga Up! online web service on December 13, 2019, and has been compiled into ten tankōbon volumes as of October 2025.[2] The manga is published in English in North America by Comikey and Square Enix through the global version of Manga Up!.

No. Japanese release date Japanese ISBN
1August 6, 2020[44]978-4-75-756754-2
2November 7, 2020[45]978-4-75-756929-4
3June 7, 2021[46]978-4-75-757298-0
4January 7, 2022[47]978-4-75-757550-9
5July 7, 2022[48]978-4-75-758011-4
6February 7, 2023[49]978-4-75-758388-7
7September 7, 2023[50]978-4-75-758770-0
8July 5, 2024[51]978-4-75-759288-9
9March 7, 2025[52]978-4-75-759602-3
10October 7, 2025[53]978-4-30-100100-3

Anime

An anime television series adaptation was announced during a livestream for the "GA Fes 2021" event on January 31, 2021, with the cast of the series' drama CDs reprising their roles.[2] It is produced by Blade and directed by Kazuomi Koga, with series composition and screenplays by Touko Machida, character designs Katsuyuki Sato, and music by Tsugumi Tanaka, Kaho Sawada, Kanade Sakuma and Hanae Nakamura.[54] The series aired from October 5 to December 21, 2025, on the NUMAnimation programming block on TV Asahi and its affiliates.[55][56][a] The opening theme song is "Uza Kawaikute Nani ga Warui!" (ウザ可愛くて何が悪い！; 'What's Wrong With Being Annoyingly Cute!'), performed by Karubi Akami, while the ending theme song is "Hoshi no Kodō" (星の鼓動; 'Beat of the Star'), performed by Kohana Lam.[57] Crunchyroll streamed the series.[58]

Episodes

No.Title [59][60]Directed by [59]Storyboarded by [59]Original release date [61][a]
1"My Friend's Little Sister Has It In for Me!"
Transliteration: "Tomodachi no Imōto ga Ore ni Dake Uzai" (Japanese: 友達の妹が俺にだけウザい)		Kazuomi KogaKazuomi KogaOctober 5, 2025 (2025-10-05)
2"The Cousin I Haven't Seen in Years Is Cold to Me"
Transliteration: "Hisabisa no Itoko ga Ore ni Dake Tsumetai" (Japanese: 久々の従姉妹が俺にだけ冷たい)		Naoko TakeichiMiyana OkitaOctober 12, 2025 (2025-10-12)
3"Only I Can Be a Pain to My Uncle’s Daughter"
Transliteration: "Oji-san no Musume ni Oredake ga Uzai" (Japanese: 伯父さんの娘に俺だけがウザい)		Naoki HishikawaMiyana OkitaOctober 19, 2025 (2025-10-19)
4"My Friend's Little Sister Might Be a Delinquent"
Transliteration: "Tomodachi no Imōto ga Moshikashite Furyō" (Japanese: 友達の妹がもしかして不良)		Daisuke TsukushiDaisuke TsukushiOctober 26, 2025 (2025-10-26)
5"My Friend's Little Sister Keeps Getting Close to Me"
Transliteration: "Tomodachi no Imōto ga Ore ni Dake Chikai" (Japanese: 友達の妹が俺にだけ近い)		Michita ShiraishiMiyana OkitaNovember 2, 2025 (2025-11-02)
6"My Friend's Little Sister Has It In for My Friend's Enemy"
Transliteration: "Tomodachi no Imōto wa Tomodachi no Teki ni Uzai" (Japanese: 友達の妹は友達の敵にウザい)		Kentarō MizunoMiyana OkitaNovember 9, 2025 (2025-11-09)
7"The Girl Who Confessed to Me Is Cold to Me in Reality"
Transliteration: "Kokuhaku Shite Kita Joshi ga Genjitsu de Dake Tsumetai" (Japanese: 告白してきた女子が現実でだけ冷たい)		Naoko TakeichiMiyana OkitaNovember 16, 2025 (2025-11-16)
8"Everyone I Know Is Being Weird With Me"
Transliteration: "Ore no Mawari no Renchū ga Ore ni Dake Okashī" (Japanese: 俺の周りの連中が俺にだけおかしい)		Naoki HishikawaHideki FutamuraNovember 23, 2025 (2025-11-23)
9"My Fake Girlfriend Gets Tough When I Respond to Her Confession"
Transliteration: "Kokuhaku no Henji ni Nise Kanojo ga Tezuyoi" (Japanese: 告白の返事にニセ彼女が手強い)		Arisa ShimaMiyana OkitaNovember 30, 2025 (2025-11-30)
10"My Friend's Little Sister Only Gets an Apology from Me"
Transliteration: "Tomodachi no Imōto ni ore Dake ga Shazai" (Japanese: 友達の妹に俺だけが謝罪)		Kentarō MizunoKōji Yoshikawa &
Hikari Takeuchi		December 7, 2025 (2025-12-07)
11"We're Perfect for Training the Drama Club"
Transliteration: "Engeki-bu no Tokkun ni Oretachi ga Tsuyoi" (Japanese: 演劇部の特訓に俺達が強い)		Naoko TakeichiMiyana OkitaDecember 14, 2025 (2025-12-14)
12"My Friend's Little Sister Really Does Have It In for Me"
Transliteration: "Yappari Tomodachi no Imōto ga Ore ni Dake Uzai" (Japanese: やっぱり友達の妹が俺にだけウザい)		Kazuomi Koga &
Yamato Hayashi		Kazuomi KogaDecember 21, 2025 (2025-12-21)

See also

Notes

  1. ^ a b TV Asahi listed the series premiere on October 4 at 25:30, which is effectively Sunday at 1:30 a.m. JST.

References

  1. ^ Harding, Daryl (January 31, 2021). "Kohai Rom-Com My Friend's Little Sister Has It In for Me! Light Novel Gets TV Anime". Crunchyroll. Retrieved October 15, 2022.
  2. ^ a b c d e f g "My Friend's Little Sister Has It In for Me! Novels Get TV Anime". Anime News Network. January 31, 2021. Retrieved January 31, 2021.
  3. ^ My Friend's Little Sister Has It In for Me! Official [@imouza_PR] (March 10, 2024). メインキャストはドラマCDからもちろん続投です☆ (Tweet) (in Japanese). Retrieved March 10, 2024 – via Twitter.
  4. ^ "友達の妹が俺にだけウザい" (in Japanese). SB Creative. 29 March 2019. Retrieved January 31, 2021.
  5. ^ "J-Novel Club Adds 5 Light Novels, 2 Manga". Anime News Network. November 14, 2020. Retrieved January 31, 2021.
  6. ^ 友達の妹が俺にだけウザい (in Japanese). SB Creative. Retrieved July 14, 2020.
  7. ^ "My Friend's Little Sister Has It In for Me! Volume 1". J-Novel Club. Retrieved November 21, 2021.
  8. ^ "My Friend's Little Sister Has It In for Me! Volume 1 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved April 15, 2022.
  9. ^ 友達の妹が俺にだけウザい2 (in Japanese). SB Creative. Retrieved July 14, 2020.
  10. ^ "My Friend's Little Sister Has It In for Me! Volume 2". J-Novel Club. Retrieved November 21, 2021.
  11. ^ "My Friend's Little Sister Has It In for Me! Volume 2 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved April 15, 2022.
  12. ^ 友達の妹が俺にだけウザい3 (in Japanese). SB Creative. Retrieved July 14, 2020.
  13. ^ "My Friend's Little Sister Has It In for Me! Volume 3". J-Novel Club. Retrieved November 21, 2021.
  14. ^ "My Friend's Little Sister Has It In for Me! Volume 3 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved April 15, 2022.
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  26. ^ 友達の妹が俺にだけウザい7 (in Japanese). SB Creative. Retrieved July 14, 2020.
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  28. ^ "My Friend's Little Sister Has It In for Me! Volume 7". J-Novel Club. Retrieved April 15, 2022.
  29. ^ "My Friend's Little Sister Has It In for Me! Volume 7 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved September 7, 2022.
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  31. ^ 友達の妹が俺にだけウザい8 ドラマCD付き特装版 (in Japanese). SB Creative. Retrieved July 14, 2020.
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  36. ^ "My Friend's Little Sister Has It In for Me! Volume 9". J-Novel Club. Retrieved February 1, 2023.
  37. ^ "My Friend's Little Sister Has It In for Me! Volume 9 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved August 7, 2023.
  38. ^ 友達の妹が俺にだけウザい10 (in Japanese). SB Creative. July 2022. Retrieved August 13, 2022.
  39. ^ 友達の妹が俺にだけウザい10 小冊子『10.5巻』付き特装版 (in Japanese). SB Creative. July 2022. Retrieved August 13, 2022.
  40. ^ "My Friend's Little Sister Has It In for Me! Volume 10". J-Novel Club. Retrieved July 9, 2023.
  41. ^ "My Friend's Little Sister Has It In for Me! Volume 10 (Paperback)". Barnes & Noble. J-Novel Club. Retrieved November 28, 2024.
  42. ^ 友達の妹が俺にだけウザい11 (in Japanese). SB Creative. 5 December 2023. Retrieved December 8, 2023.
  43. ^ "My Friend's Little Sister Has It In for Me! Volume 11". J-Novel Club. Retrieved September 17, 2025.
  44. ^ 友達の妹が俺にだけウザい 1 (in Japanese). Square Enix. Retrieved July 14, 2021.
  45. ^ 友達の妹が俺にだけウザい 2 (in Japanese). Square Enix. Retrieved July 14, 2021.
  46. ^ 友達の妹が俺にだけウザい 3 (in Japanese). Square Enix. Retrieved July 14, 2021.
  47. ^ 友達の妹が俺にだけウザい 4 (in Japanese). Square Enix. Retrieved January 19, 2022.
  48. ^ 友達の妹が俺にだけウザい 5 (in Japanese). Square Enix. Retrieved July 4, 2022.
  49. ^ 友達の妹が俺にだけウザい 6 (in Japanese). Square Enix. Retrieved February 1, 2023.
  50. ^ 友達の妹が俺にだけウザい 7 (in Japanese). Square Enix. Retrieved September 1, 2023.
  51. ^ 友達の妹が俺にだけウザい 8 (in Japanese). Square Enix. Retrieved June 25, 2024.
  52. ^ 友達の妹が俺にだけウザい 9 (in Japanese). Square Enix. Retrieved February 28, 2025.
  53. ^ 友達の妹が俺にだけウザい 10 (in Japanese). Square Enix. Retrieved September 30, 2025.
  54. ^ "My Friend's Little Sister Has It In for Me! Anime Unveils Main Staff". Anime News Network. March 10, 2024. Retrieved March 10, 2024.
  55. ^ "My Friend's Little Sister Has It In for Me! Anime's Teaser Unveils October Debut". Anime News Network. January 4, 2025. Retrieved January 4, 2025.
  56. ^ "My Friend's Little Sister Has It In for Me! Anime Reveals Teaser Video, Visual". Anime News Network. June 16, 2025. Retrieved June 16, 2025.
  57. ^ "My Friend's Little Sister Has It In for Me! Anime's Main Trailer Reveals Theme Songs, October 4 Debut". Anime News Network. August 25, 2025. Retrieved August 25, 2025.
  58. ^ "Crunchyroll Announces Release Schedule for Fall 2025 Season". Anime News Network. September 17, 2025. Retrieved September 17, 2025.
  59. ^ a b c "Sutōrī｜Terebi Anime「Tomodachi no Imōto ga Ore ni Dake Uzai」Kōshiki Saito" ストーリー | TVアニメ「友達の妹が俺にだけウザい」公式サイト [Story｜TV Anime「My Friend's Little Sister Has It In for Me!」Official Site]. www.imouza-animation.com (in Japanese). Retrieved October 4, 2025.
  60. ^ "Watch My Friend's Little Sister Has It In for Me! - Crunchyroll". Retrieved October 4, 2025.
  61. ^ "On'ea (Hōsō・Haishin Jōhō)｜Terebi Anime「Tomodachi no Imōto ga Ore ni Dake Uzai」Kōshiki Saito" ON AIR(放送・配信情報) | TVアニメ「友達の妹が俺にだけウザい」公式サイト [On Air (Broadcast ・Distribution Information)｜TV Anime「My Friend's Little Sister Has It In for Me!」Official Site]. www.imouza-animation.com (in Japanese). Retrieved October 4, 2025.
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