ONE OK ROCK is a Japanese Rock band formed in the summer of 2005. It was started by Toru with High School friends Alex and Ryota after each of them got their musical instruments. After that, Taka joined as their vocalist and they focused on performing shows in the Tokyo area.

In 2006 they independently released 2 mini albums. Because of their albums sales, their participation in relatively large festivals that summer and their energetic shows in the outskirts of Tokyo, they were noticed by a foreign record company.

In March 2007 Tomoya officially joined the group and the band finally made their major debut by releasing their first single 内秘心書(Naihi Shinsho) on April 25th.

The band's name, One Ok Rock, came from "one o'clock," the time that the band used to practice on weekends. However, noticing that the Japanese language made no distinction between r's and l's, they changed "o'clock" to "o'crock" (or "o'krock") which then was separated to become "ok rock".

On April 5th, 2009, Alex was arrested for allegedly groping a female prep school student. They were going to release the single 「Ａｒｏｕｎｄ　ザ　ｗｏｒｌｄ　少年」on May 6th but this was cancelled. The song was also going to be used for the drama 'God Hand Teru' but was replaced. Also, a nationwide tour was cancelled because of the incident. On May 15th, it was announced the Alex has left the group and the other 4 members would continue activites in the summer without him.

Members

* Taka (森内 寛貴, Moriuchi Takahiro, born April 17, 1988 in Tokyo) - Vocals. Former News member.

* Toru (山下 亨, Yamashita Tōru, born December 7, 1988 in Osaka) - guitar and some vocals. Former member of the hip-hop dance group, Heads.

* Ryota (小浜 良太, Kohama Ryōta, born September 4, 1989 in Osaka) - bass. Former member of hip-hop dance group, Heads.

* Tomoya (神吉 智也, Kanki Tomoya, born June 27, 1987 in Hyogo) - drums.

Former members

* Alex (鬼澤ｱﾚｸｻﾝﾀﾞ, Alexander Onizawa, born March 19, 1988 in San Francisco) - guitar. Officially left band as of May 2009.

Releases

*「One Ok Rock」 1st Mini Album (2006/7/26)

*「Keep It Real」 2nd Mini Album (2006/12/16)

*「内秘心書」 1st Single (2007/4/25)

*「努努-ゆめゆめ-」 2nd Single (2007/7/25)

*「エトセトラ」 3rd Single (2007/10/24)

*「ゼイタクビョウ」 1st full-length album (2007/11/21)

*「世の中シュレッダー」 1st live DVD (2008/3/19)

*「BEAM OF LIGHT」 2nd full-length album (2008/5/28)

*「感情エフェクト」 3rd full-length album (2008/11/12)

*「完全感覚Dreamer」4th Single (2010/02/03)

*「Nicheシンドローム」4th full-length album (2010/06/09)

*「アンサイズニア」 5th Single (2011/02/16)

*「THIS IS MY BUDOKAN?! 2010.11.28」2nd Live DVD (2011/02/16)

*「Re:make / NO SCARED」6th Single/Double A-Side (2011/07/20)

*「残響リファレンス」5th full-length album (2011/10/05)

*「”残響リファレンス”TOUR in YOKOHAMA ARENA」3rd Live DVD (2012/05/30)

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