Tonai Bousho
| Company type | Idol group |
|---|---|
| Industry | Music |
| Founded | 2022 |
| Defunct | 2024 |
| Fate | Merged with Mameshiba no Taigun to form Mameshiba no Taigun Tonai Bousho a.k.a. MonsterIdol |
| Headquarters | Japan |
| Products | Music (singles, albums) |
Tonai Bousho was a Japanese alternative idol girl group created through the reality competition program Monster Love, featured on TBS Television's variety show Wednesday's Downtown in 2022. Their debut track, "Cookie," was launched on December 15, 2022. Activities concluded in January 2024 when they combined forces with Mameshiba no Taigun, resulting in the formation of Mameshiba no Taigun Tonai Bousho a.k.a. MonsterIdol.
History
The group Tonai Bousho came together on December 14, 2022, via the TBS reality series Monster Love. Their introductory single, "Cookie," was released the following day, December 15. Shortly after, on December 21, member Richi declared her intention to leave by December 31 to pursue a relationship with Kuro-chan from Wednesday's Downtown. That same day marked the start of auditions for replacements.
On February 15, 2023, new members Kino, Izuki, and Chihiro were added to the lineup. They followed up with the digital single "Have a Nice Day" on February 26. Both Mina and Chihiro exited the group on April 3. The second digital single, "Tonai Girl's," was released on May 1. Miku began a hiatus due to health reasons on May 26. Subsequent singles included "Like or Love" (June 5), "Cotton Candy Story" (July 23), and "Ice Cream no Hoshi" (August 17). Their debut album, Where Are You Going?, was unveiled on September 27. Kino graduated on October 1 as Miku returned; Izuki departed on December 2.
On January 6, 2024, Tonai Bousho merged with Mameshiba no Taigun, forming the five-member ensemble known as Mameshiba no Taigun Tonai Bousho a.k.a. MonsterIdol.
Former
- , who joined Hinatazaka46 in 2025
Studio albums
| Title | Album details | Highest chart rankings | |
|---|---|---|---|
| Oricon | Billboard | ||
| Where Are You Going? |
|
— | 47 |
Singles
| Title | Year | Peak chart rankings |
Album |
|---|---|---|---|
| Oricon | |||
| "Cookie" (クッキー) | 2022 | 25 | Where Are You Going? |
| "Have a Nice Day" (ハバナイスデーイ) | 2023 | — | |
| "Tonai Girl's" | — | ||
| "Like or Love" | — | ||
| "Cotton Candy Story" | — | ||
| "Ice Cream no Hoshi" (アイスクリームの星) | — | ||
| The symbol "—" denotes releases that did not enter charts or were unavailable in that market. | |||