X4 is a 5 member Japanese boy group composed by pop artist, Matsushita Yuya. They were signed under Yuya's independent record label, Japanese Dream Records, in 2014 as a 4 member band. They released their first full-length album XVISION on February the 22nd, 2015.
"Killing Me" was the first and last single to be released as a 4 member band - SJ departed shortly after. Debuted as trio, and released two following singles "Snow Flakes" and "Obsession" before they announced the searching for the 4th member on their official homepage and Twitter. In the middle of February 2016, X4 announced their two new members -Shota and Jukiya- and together with it, the new singles that will be released shortly after; Party Up and IDKYN (I Don't Know Your Name) with the appearance of the two new members.
Almost like a huge comeback, X4 made a nation tour all around Japan within 23 days starting on April 1, 2016 ~ May 26, 2016.
Matsushita Yuya (松下 優也)