One Ok Rock, stylized as ONE OK ROCK, is a Japanese rock band, formed in Tokyo, Japan in 2005. The band currently consists of Takahiro Moriuchi (vocalist), Toru Yamashita (guitarist, bandleader), Ryota Kohama (bassist), and Tomoya Kanki (drummer). They have been playing many different styles of music, with songs ranging from alternative rock to emo to post-hardcore to pop rock. The band's name comes from "one o'clock", the time that the band used to practice their music on weekends.
Their debut single, "Naihishinsho", reached number 48 on the Oricon Charts and sold 15,000 copies. Their second single, Yume Yume, followed that success and charted at number 43. After those singles, they released their debut album Zeitakubyo in 2007 and had their first tour, the Tokyo-Osaka-Nagoya Quattro Tour. They released their second album Beam of Light in May 2008. In an interview with Rockin'On Japan magazine in June 2012, ONE OK ROCK said they didn't count this album as an album, but rather as a part of growing up as a band. When they made the album, they hadn't been in the right mood, but felt that they had to make it to grow as a band. The band came up with many sound sources and ended up making a punk album. The album's confused origins were the reason why they wouldn't play any songs from Beam of Light in live performances until now. Shortly after releasing Beam of Light, they performed a gig at Shibuya AX. They had planned to release two albums in that one year, so they released Kanjo Effect in November 2008. At this point, the band had gained more experience and were able to do some more serious recording. They settled into the western sound they loved and followed by replacing all their engineers and introducing their music to new producers. This led to some division within the band - Taka and Alex in particular disagreed about how to make this album. On April 5, 2009, Alex was arrested for groping the leg of a twenty-one-year-old female student on a train. He admitted to the charges and the case was settled out of court. The band reached their weakest point at this time. Ryota intended to leave bass and take up guitar. They felt it was impossible for them to add a new member. The band's next single "Around the World Shounen", which was planned for a May 6 release and to be used as the theme song for the TV drama God Hand Teru, and their nationwide tour were both cancelled. In May 2009, it was announced that One Ok Rock would continue on without Alex, who went back to the United States. Toru took his place as lead guitar, and the band re-arranged their songs to be played for one guitar.

Q: when did onizawa depart?
A: May 2009, it was announced that One Ok Rock would continue on without Alex, who went back to the United States.

Q: why did he go back to the US?
A: unknown

Q: who took his place?
A: Toru took his place as lead guitar, and the band re-arranged their songs to be played for one guitar.
what's another release from 2007-2009?
After those singles, they released their debut album Zeitakubyo in 2007 and had their first tour, the Tokyo-Osaka-Nagoya Quattro Tour. they released their debut album Zeitakubyo in 2007 Their debut single, "Naihishinsho", reached number 48 on the Oricon Charts and sold 15,000 copies. They released their second album Beam of Light in May 2008.
They released their second album Beam of Light in May 2008.