Kazuya Kamenashi
The single is co-written by SPIN, a frequent songwriter for KAT-TUN who is also known for writing hit singles for Arashi ("Kitto Daijōbu", "Love so sweet", "Pikanchi Double" and "Hero" all reached number 1). The track's music was composed by Shusui, Fredrik Hult, Carl Utbult and additional arrangement was done by Yukihide "YT" Takiyama. The solo tracks featured on the three limited editions are "w/o notice??" (sung by Kazuya Kamenashi), "'" (Junnosuke Taguchi), "LOVEJUICE" (Jin Akanishi), "PARASITE" (Koki Tanaka), "'" (Tatsuya Ueda) and "SMACK" (Yuichi Nakamaru).