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Onimai - Wikipedia

  • ️Thu Jan 05 2023

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Onimai

Cover of the first volume

お兄ちゃんはおしまい!
(Onii-chan wa Oshimai!)
GenreComedy,[1] slice of life[2]
Manga
Written byNekotofu
Published byIchijinsha
English publisher
MagazineMonthly Comic Rex (April 27, 2019–present)
DemographicShōnen
Original runFebruary 25, 2017 – present
Volumes9
Anime television series
Directed byShingo Fujii
Produced by
  • Takurou Hatakeyama
  • Mitsuteru Hishiyama
Written byMichiko Yokote
Music by
  • Daisuke Achiba
  • Alisa Okehazama
StudioStudio Bind
Licensed byCrunchyroll
Original networkAT-X, Tokyo MX, BS11
Original run January 5, 2023 – March 23, 2023
Episodes12
icon Anime and manga portal

Onimai: I'm Now Your Sister! (Japanese: お兄ちゃんはおしまい!, Hepburn: Onii-chan wa Oshimai!, lit. 'Older Brother Is Done For!')[a] is a Japanese manga series written and illustrated by Nekotofu. The series has been serialized online since 2017; it is also currently serialized in Ichijinsha's Monthly Comic Rex magazine since April 2019. It is licensed in English by Kodansha USA. An anime television series adaptation by Studio Bind aired from January to March 2023; it gained high ratings, although it received a mixed reception from foreign critics.

The series follows Mahiro Oyama, an otaku and NEET who lives alone with his scientist younger sister Mihari. One day he wakes up to find himself transformed into a young girl, a result of one of Mihari's experiments. Mahiro must now learn to become comfortable in his new body whilst living life as a middle school girl.

Mahiro Oyama (緒山 真尋, Oyama Mahiro)[b]
Voiced by: Marika Kōno[2]
The protagonist of the series, Mahiro was previously an otaku man living with his younger sister Mihari until he was turned into a girl as a result of one of her experiments. Mahiro ends up transferring to a middle school. Mahiro is fond of playing video games and mainly stayed at home before being turned into a girl.
Mihari Oyama (緒山 みはり, Oyama Mihari)
Voiced by: Kaori Ishihara[2]
Mahiro's younger sister and a scientist. She turned Mahiro into a girl as a result of one of her experiments. Due to her high intelligence, she skipped several grades and is now a university student.
Kaede Hozuki (穂月 かえで, Hozuki Kaede)
Voiced by: Hisako Kanemoto[3]
Mihari's classmate during middle school and a gyaru. She is Momiji's older sister. She is good at cooking and using cosmetics. She also works part-time at a fast food restaurant.
Momiji Hozuki (穂月 もみじ, Hozuki Momiji)
Voiced by: Minami Tsuda[3]
Kaede's younger sister and Mahiro's classmate. She has a tomboyish personality and greatly admires Mahiro. She has been friends with Asahi for several years.
Asahi Ōka (桜花 朝日, Ōka Asahi)[c]
Voiced by: Kana Yūki[4]
Mahiro's classmate. She has an energetic personality but tends to not perform well in tests. She also calls Mahiro by many nicknames.
Miyo Murosaki (室崎 美夜, Murosaki Miyo)[d]
Voiced by: Natsumi Hioka[4]
Mahiro's classmate. She is interested in yuri and tries to hide it poorly. She enjoys imagining her friends in romantic situations. Miyo is notably bustier than her classmates and embarrassed about it.
Nayuta Tenkawa (天川 那由多, Tenkawa Nayuta)[e]
Mahiro's classmate who joins during their second year of middle school. She is a bright, yet shy girl who is the ward of Mihari's faculty advisor Chitose Azuma, who is having her monitor Mahiro without Mihari's knowledge. After revealing to Mahiro that she knows the truth about her, she is quickly accepted into Mahiro's group of friends. She is very knowledgeable due to the many hours she spent in the university library, and speaks in a very polite tone with everyone she encounters.
Chitose Azuma (吾妻 ちとせ, Azuma Chitose)
Voiced by: Mayu Mashiro (drama CD)
Mihari's faculty advisor and senpai at the university Mihari attends, as well as Nayuta's guardian. She made key contributions that allowed for the creation of the drug that turned Mahiro into a girl. Although Mihari believes that she did this out of the goodness of her heart, she is actually using Mihari to fulfill an unknown agenda and enrolled Nayuta into the same class as Mahiro to spy on her without Mihari's knowledge.

Prior to creating the series, Onimai's author, Nekotofu, was a fan of the "gender bender" genre of anime and manga that included such works as Ranma ½, Kashimashi: Girl Meets Girl, and Idol Pretender [ja].[5] As such, Nekotofu had harbored a longtime interest in creating his own such series, and was inspired to do so after seeing Your Name.[6][7] He was also motivated by the positive response to a doujinshi he had created which also featured similar gender-bending elements. Nekotofu began self-publishing Onimai on Pixiv in January 2017, and later on Niconico Seiga, where it became significantly more popular.[5] In April 2019, the manga began serialization in Ichijinsha's Monthly Comic Rex magazine.[1][8] Nekotofu continues to self-publish the series online and produce doujinshi with permission from Ichijinsha.[5]

Written and illustrated by Nekotofu, Onimai: I'm Now Your Sister! began serialization online via Pixiv and other platforms in 2017.[1] It also started in Ichijinsha's Monthly Comic Rex magazine on April 27, 2019.[8] As of September 2024, nine tankōbon volumes have been released by Ichijinsha.[9] In North America, Kodansha USA is publishing the series digitally in English.[10]

No. Original release date Original ISBN English release date English ISBN
1 June 27, 2018[11]978-4-7580-6750-8August 31, 2021[12]978-1-63-699336-2
2 January 26, 2019[13]978-4-7580-6792-8October 5, 2021[14]978-1-63-699337-9
3 September 27, 2019[15]978-4-7580-6828-4November 30, 2021[16]978-1-63-699373-7
4 July 27, 2020[17]978-4-7580-6883-3January 25, 2022[18]978-1-63-699431-4
5 May 27, 2021[19]978-4-7580-6917-5March 22, 2022[20]978-1-63-699481-9
6 April 27, 2022[21]978-4-7580-6977-9October 25, 2022[22]978-1-68-491505-7
7 January 7, 2023[23][24]978-4-7580-8400-0
978-4-7580-8401-7 (SE)		July 25, 2023[25]979-8-88-933052-3
8 November 27, 2023[26][27]978-4-7580-8456-7
978-4-7580-8457-4 (SE)		June 18, 2024[28]979-8-88-933498-9
9 September 27, 2024[9][29]978-4-7580-8582-3
978-4-7580-8583-0 (SE)		——

An anime television series adaptation was announced on April 22, 2022. It is produced by Studio Bind and chief directed by Shingo Fujii, with Michiko Yokote as head writer, character designs handled by Ryo Imamura, and music composed by Daisuke Achiba and Alisa Okehazama.[1][30] The series aired from January 5 to March 23, 2023, on AT-X and other networks.[3][31] The opening theme song is "Identeitei Meltdown" (アイデン貞貞メルトダウン) by Enako feat. P Maru-sama, while the ending theme song is "Himegoto*Crisisters" (ひめごと＊クライシスターズ) by Marika Kōno, Kaori Ishihara, Hisako Kanemoto, and Minami Tsuda.[32] Crunchyroll has licensed the series outside of Asia.[33] Medialink has licensed the series in Asia-Pacific.[34]

Onimai: I'm Now Your Sister! ranked fifth in Da Vinci's Next Manga Award 2018 in the web manga category in August 2018,[37] and ranked ninth in Web Manga Overall Election 2019 in October 2019.[38] The manga also ranked third in AnimeJapan's Manga We Want to See Animated Ranking in 2020,[39] and ranked seventh in 2021.[40]

The series received positive reviews and was ranked by viewers in Japan as the top-rated TV anime of the Winter 2023 season on both Niconico and anime ranking website Anikore.jp.[41][42] One Japanese-language reviewer, writing for 4Gamer.net, echoed positive sentiments regarding its music and art style.[43] Shoki Ota, writing for KAI-YOU [ja], said the series was remarkable for its meticulous depiction of everyday life, and said, "While it might not be for everyone due to its gender swap themes, it feels like a condensed work amid the recent 'anime festival', making it a must-see this season".[44]

In early English-language coverage of the series, the critical response to Onimai's first few episodes were mixed[45][46][47] despite the high user ratings.[48] Some reviewers criticized the first episode's premise and lolicon themes, and perceived incestuous overtones, while praising the animation and music, which was near-universally deemed to be of exceptional quality.[45][49][47] Rebecca Silverman was softer in her criticisms, describing the fan service as "relatively toned down" but stated that the narrative premise was too "mean" for her to enjoy and squandering its potential.[45]

Kim Morrissy, reviewing the anime for Anime News Network, was more positive, saying "Onimai is the best anime of the season."[47] Morrissy strongly praised the narrative, humor, art, and animation production, particularly the work of series director Shingo Fujii, who previously worked on Precure.[47][50][51] Sakugablog also mentioned Onimai multiple times in their Sakugabooru Animation Awards 2023 for Best Show, Best Animation Design, and other categories but did not give it any awards.[52]

In February 2023, fans of Onimai sent numerous gifts to the staff of Studio Bind, the production studio of the anime, which series director Shingo Fujii posted photos of in a tweet voicing thanks for the support.[53][54]

  1. ^ "Oshimai" written phonetically to have a double meaning of お終い "done for" and お姉妹 "sister"
  2. ^ As a girl, Mahiro's name is written as 緒山 まひろ, which has the same reading but is written differently.
  3. ^ Her given name is usually written in hiragana (あさひ) in the series.
  4. ^ Her given name is usually written in hiragana (みよ) in the series.
  5. ^ Her given name is usually written in hiragana (なゆた) in the series.
  6. ^ "girl's day" (女の子の日) is a euphemism for menstrual day
  1. ^ a b c d Pineda, Rafael Antonio (April 22, 2022). "ONIMAI: I'm Now Your Sister! Gender-Bending Comedy Manga Gets TV Anime". Anime News Network. Archived from the original on October 7, 2022. Retrieved April 22, 2022.
  2. ^ a b c Dempsey, Liam (April 22, 2022). "ONIMAI: I'm Now Your Sister! Slice of Life Manga Gets TV Anime Adaptation". Crunchyroll. Archived from the original on September 28, 2022. Retrieved April 22, 2022.
  3. ^ a b c Pineda, Rafael Antonio (August 11, 2022). "ONIMAI: I'm Now Your Sister! Anime's Video Reveals More Cast, January 2023 Premiere". Anime News Network. Archived from the original on August 12, 2022. Retrieved August 12, 2022.
  4. ^ a b Pineda, Rafael Antonio (December 4, 2022). "ONIMAI: I'm Now Your Sister! Anime's 2nd Video Reveals More Cast & Staff, January 5 Debut". Anime News Network. Archived from the original on December 5, 2022. Retrieved December 4, 2022.
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  20. ^ ONIMAI: I'm Now Your Sister!, Volume 5. Kodansha USA. Archived from the original on April 22, 2022. Retrieved April 22, 2022.
  21. ^ "お兄ちゃんはおしまい！ (6)" (in Japanese). Ichijinsha. Archived from the original on April 22, 2022. Retrieved April 22, 2022.
  22. ^ ONIMAI: I'm Now Your Sister!, Volume 6. Kodansha USA. Archived from the original on December 5, 2022. Retrieved December 6, 2022.
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