2 + 2 + 7 is? 11!

— 22/7[1]

22/7 (ナナブンノニジュウニ pronounced "nanabun no nijyuuni") or shortened as ナナニジ (pronounced "nananiji") is a Japanese digital seiyuu idol group. The project is described as "Idols Who Cross Dimensions" and was formed by a collaboration of Yasushi Akimoto, Aniplex and Sony Music Records. The group consists of 11 members and is led by Reika Sato/Chiharu Hokaze with Miu Takigawa/Nagomi Saijo as their center.

In the anime, 22/7 is managed by Aoi Goda and the company G.I.P. In real life, 22/7's manager is Nina.

22/7's group color is light blue.[2]

Introduction[edit | edit source]

22/7 (nanabun no nijyuuni) is a Japanese digital idol and voice actors’ project produced by famed music producer Yasushi Akimoto in collaboration with Aniplex and Sony Music Records. By combining work from well-regarded talents in the anime industry with state-of-the-art technology, 22/7 (nanabun no nijyuuni) has perfectly blended elements of anime with real-life idols to create a unique entertainment experience. Since the group’s debut in 2017, they have gained a global following for their multimedia content, which includes voice acting, Virtual YouTuber activities, and music performances.[3]

Etymology[edit | edit source]

"22/7 (twenty-two sevenths)" is a rational number that is an approximation of π (Pi), a number that goes on for infinity. The group was named it to represent the infinite possibilities and opportunities that could happen to the group. In the anime it was given by the Wall. In real life, it was given by their producer Yasushi Akimoto.

Members[edit | edit source]

To clear any confusion as to why there are sometimes only eight members present and other times eleven, 22/7 was originally only supposed to have eight members to voice the eight characters that were teased, although they expanded it to eleven (actually twelve), thus leaving three members having no character to voice until September 20, 2018. Because of this, many early activities were done without them, including their debut single and even the anime.

Characters[edit | edit source]

Seiyuu[edit | edit source]

Sub-Units[edit | edit source]

History[edit | edit source]

The first promo shot of the eight characters together, all drawn by Horiguchi, rather than the various other artists.

The full history of 22/7 can be seen here.

2016[edit | edit source]

A multimedia project created by Yasushi Akimoto, Aniplex and Sony Music Records held auditions for 8 initial characters from November 11 to December 24, 2016. From a pool of 10,325 female applicants aged 15 to 25, 11 members (actually 12) were chosen.

On December 25, 2016, the idol unit name was revealed to be 22/7. The name was chosen because it is an approximation of pi, an irrational number that can not be expressed in integer division.[4]

2017[edit | edit source]

From May 9 to May 19, 2017, 8 of the 11 members were permanently assigned their characters.

On April 9, 2017, 22/7's first radio show "22/7 Warikirenai Radio" began airing.

On July 22, 2017, an anime adaption was announced during their first live event.

On September 20, 2017, 22/7 released their debut single "Boku wa Sonzai Shiteinakatta."

2018[edit | edit source]

The first promo shot of all eleven characters, drawn by Horiguchi, for the 22/7 TV Variety Show, 22/7 Keisanchuu.

On April 11, 2018, 22/7 released their second single "Shampoo no Nioi ga Shita."

On March 24, 2018, 22/7's ONA "The Diary of Our Days" began airing.

On July 7, 2018, 22/7's TV show "22/7 Keisanchuu" began airing.

On August 22, 2018, 22/7 released their third single "Rikaisha."

On September 20, 2018, the three remaining characters were revealed and assigned to the last three members.

2019[edit | edit source]

On April 8, 2019, Sally and Mizuha's radio show "Kuraten!" began airing.

On August 21, 2019, 22/7 released their fourth single "Nani mo Shiteagerarenai."

On October 1, 2019, it was announced that due to undisclosed health issues, Mei would be taking a break from 22/7 and related activities. 

On December 12, 2019, it was announced that Mei would permanently graduate from 22/7 by the end of 2019 due to seeing difficulty recovering while carrying out idol activities.[5]

On December 24, 2019, The new member succeeding Mei's position was revealed to be Uta Kawase who would then be the new voice of Nicole Saito. It was also revealed that a new rhythm mobile game called "22/7 Ongaku no Jikan" would release in Spring 2020.

2020[edit | edit source]

On January 11, 2020, 22/7's anime began airing.

On January 12, 2020, 22/7's manga began publishing.

On February 5, 2020, it was announced that due to undisclosed health issues, Urara would be taking a break from 22/7 and related activities.[6]

On February 24, 2020, it was announced that due to undisclosed health issues, Mizuha would be taking a break from 22/7 and related activities.[7]

On February 26, 2020, 22/7 released their fifth single "Muzui."

The four different possible formations for sub-units.

On April 4, 2020, 22/7's TV show "22/7 Keisanchuu" second season began airing. 22/7's successor radio show "22/7 Warikirenai Radio+" began airing.

On May 15, 2020, Urara returned from her hiatus and resumed her activities with 22/7.[8]

On May 27, 2020, 22/7's moblie game Ongaku no Jikan was released. 22/7's digital single "Kaze wa Fuiteru ka?" was released on the same day as well.

From July 1 to July 15, 2020, fans voted between four possible sub-unit formations to be under 22/7. On July 22, it was announced that option 2 had won.

On September 20, 2020, Mizuha returned from her hiatus and resumed her activities with 22/7.

On September 30, 2020, 22/7 released their sixth single "Kaze wa Fuiteru ka?"

On December 23, 2020, it was announced that Chiharu would graduate from 22/7 on February 28, 2021 due to wanting to pursue solely a voice actor carrier.

2021[edit | edit source]

On February 24, 2021, 22/7 will release their seventh single "Boku ga Motteru Mono Nara."

On February 28, 2021, Chiharu will graduate from the group.

Discography[edit | edit source]

The full discography of 22/7 can be seen here.

  1. Boku wa Sonzai Shiteinakatta
  2. Shampoo no Nioi ga Shita
  3. Rikaisha
  4. Nani mo Shiteagerarenai
  5. Muzui
  6. Kaze wa Fuiteru ka?
  7. Boku ga Motteru Mono Nara

Gallery[edit | edit source]

The gallery of 22/7 can be seen here.

References[edit | edit source]

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