are a J-pop duo formed in 2018. The duo was formed when its member, Itsuki, asked Narito to be his duo member when they had to perform at the event sponsored by the music school in Tokyo, where they both graduated. The duo was later discovered by the Japanese record label

Being In metaphysics, ontology is the philosophical study of being, as well as related concepts such as existence, becoming, and reality. Ontology addresses questions like how entities are grouped into categories and which of these entities exis ...

and made a contract with the company. In April 2020, they released the debut single "12cm", produced by Seiji Kameda. Their debut extended play, ''Just Believe You'' (2020) reached number 20 on the Oricon Daily Albums chart. The extended play consists of the previously released singles: "12cm", "Hoshiai", and "Just Believe You". The latter two have served as the theme songs to the Japanese animated television series, ''

Case Closed ''Case Closed'', also known as , is a Japanese detective manga series written and illustrated by Gosho Aoyama. It has been serialized in Shogakukan's ''shōnen'' manga magazine ''Weekly Shōnen Sunday'' since January 1994, with its ch ...

''.

History

In 2018, all at once was formed when Itsuki asked his classmate at the musical school, Narito, to be his musical partner. In 2019, they were discovered by a Japanese record label

, and made a musical contract. In October 2019, they began posting music covers on Twitter. The cover of C&K song "Y" gained over one million views in less than two weeks. In November 2019, the duo served as an opening act for Mai Kuraki's 20th Anniversary Mai Kuraki Live Project 2019 "Let's Goal!: Barairo no Jinsei" ahead of the debut. In April 2020, all at once released their debut single "12cm", produced by Seiji Kameda. The single was planned to be released both digitally and physically, however the release of CD single was cancelled as a result of COVID-19 pandemic. The

B-side The A-side and B-side are the two sides of phonograph records and cassettes; these terms have often been printed on the labels of two-sided music recordings. The A-side usually features a recording that its artist, producer, or record compan ...

track of the single, "Take Mo' Chance" served as the theme song to the 2020 Japanese animated television series, ''

A Destructive God Sits Next to Me is a Japanese manga series by Arata Aki. It was serialized in Media Factory's ''shōjo'' manga magazine ''Monthly Comic Gene'' from January 2013 to April 2020, and was collected in twelve ''tankōbon'' volumes. An anime television series adap ...

''. Their second single "Hoshiai" was released on 1 August 2020, and served as the theme song to the Japanese animated television series ''

''. The song has been streamed more than two million times on the audio streaming platforms. The duo released their third single "Just Believe You" on 4 October 2020. The song was written by Mai Kuraki,

Aika Ohno Aika may refer to: Arts and media * ''Aika'' (album), a 1996 album by Finnish singer-songwriter Aki Sirkesalo *''Agent Aika'', a 1997 anime OVA produced by Bandai Visual and Studio Fantasia *AIKA Online, an MMORPG *Aikakone or Aika, a Finnish mu ...

, and Giorgio Cancemi, and sampled Mai Kuraki song "

Secret of My Heart "Secret of My Heart" is a song by Japanese singer songwriter Mai Kuraki, taken from her debut album ''Delicious Way'' (2000). It was released on April 26, 2000 and peaked at number two on the Oricon Singles Chart, Oricon Weekly Singles Chart. I ...

" (2000). Their debut extended play ''Just Believe You'' was released on 27 January 2021. The physical version of extended play was released in two editions: standard edition and ''Case Closed'' edition. In January 2021, the duo announced that they would broadcast their first headlining concert, all at once Online Live ~Zero to One~ on 7 February 2021.

Discography

Studio albums

Extended plays

Singles

As lead artist

Music videos

References

{{authority control Musical groups established in 2018 Japanese musical duos B Zone artists 2018 establishments in Japan