The band 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".
After Alex left the band in May 2009, the band released the single "Kanzen Kankaku Dreamer" on February 3, 2010. It was featured 9th in the Weekly Oricon Charts. They released their fourth studio album titled Niche Syndrome on June 9, 2010.
Members
- Taka (森内 寛貴 Moriuchi Takahiro, born April 17, 1988 in Tokyo) is the main vocalist of the group. He is the son of Shinichi Mori. Prior to debuting with One Ok Rock, he was a member of NEWS, a Japanese Music Group under Johnny's Entertainment.
- Toru (山下 亨 Yamashita Tōru, born December 7, 1988 in Osaka) is the guitarist of the group. He also contributes some vocals. He was a member of the hip-hop dance group Heads.
- Ryota (小浜 良太 Kohama Ryōta, born September 4, 1989 in Osaka) is the bassist of the group. He was also a member of Heads.
- Tomoya (神吉 智也 Kanki Tomoya, born June 27, 1987 in Hyogo) is the drummer of the group.
Former members
- Alexander Onizawa (born March 19, 1988 in San Francisco) was the guitarist of the group alongside with Toru, until he left in May 2009 after being arrested on charges of groping.