"Run For You" is the sixteenth single by Japanese boy band KAT-TUN. The song "Run For You" is featured in a TV commercial for the Suzuki Solio, while "Cosmic Child" will be used in commercials for Wacoal products. "Diamond" will be used as the "image song" for "Dramatic Game 1844".

Chain is the Sixth studio album by Japanese boy band KAT-TUN and was released in Japan on February 22, 2012 by J-One Records. On January 13, KAT-TUN endorsed the mobile game site "entag!" which used KAT-TUN's album track "Smile for You" as a CM song and the first-ever KAT-TUN animation, "Ai wa KAT-TUN", voiced by KAT-TUN themselves, was launched on entag! site for a limited period. Ai wa KAT-TUN hit 1,000,000 views in just 2 weeks.