name: Alexander onizawa (鬼澤ｱﾚｸｻﾝﾀﾞｰ
birthday: March 19th, 1988
birthplace: San francisco, united states
blood type: B
height: 180cm
weight: 62kg
shoe size: 27 cm
measurements: 90 - 70 - 92 cm

the band formed in summer 2005 with toru, alex, ryota, and tomo. Later, taka joined and they focused on performing lives in the tokyo area. In 2006, tomo left the band to pursue a career in acting. Not long after, the band independently released two mini-albums. Because of their mini-album sales, their participation at summer festivals, and their lives in the outskirts of tokyo, they were signed to a-sketch. In march 2007, tomoya officially joined the group and the five-person band made their major debut by releasing their first single, "naihi shinsho", on april 25th.

In april 2009, alex was arrested due to sexual harassment, causing the cancel of the band's upcoming single, "around the world shounen", its drama tie-in with godhand teru, and their 2009 tour. Following the scandal, the band revealed that alex was officially no longer a part of the band.

One ok rock continued as a four-member group and made a comeback with a live concert tour that started on september 5, 2009, titled overcome emotion. Their first release afterwards was their fourth single, "kanzen kankaku dreamer", on february 3, 2010. The band followed up with their fourth album, niche syndrome, which was released on june 9.

the foundation for one ok rock began when toru yamashita, then a high school student, wanted to start a band. Toru told his friend ryota kohama, who had been a fellow member of hip hop dance group, heads, to learn the bass and asked alex to join. After seeing taka, a vocalist, perform in a cover band, toru saw him as the best possible candidate for a vocalist in their band, and insisted that he join. Tomoya, the last member to join, joined one ok rock as a drummer in 2007.[2] tomoya had played with the band on all their albums but only became an official member when they debuted.

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".

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. Their next single "answer is near" was released on february 16, 2011.

The band released their first double a-side single "re:make/no scared" on july 20, 2011, the latter song being the main theme for the black rock shooter videogame.

The band's fifth album, zankyo reference is scheduled to be released on october 5, 2011.

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