As previously reported, "UNLOCK" is the theme song to NTV drama "Kaito Yamaneko" starring a member Kamenashi Kazuya.

The single will have three versions; limited edition 1 and 2, as well as a standard edition. Both limited editions will come with a DVD with different content, and all versions will include a KAT-TUN photo name card (to be chosen randomly among 15 different cards).

On a side note, KAT-TUN is also releasing their 25th single "TRAGEDY" on February 10.

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[UNLOCK]
Limited Edition 1
- CD
01. UNLOCK
02. Unknown Title A
- DVD
"UNLOCK" Video Clip + Making-of

Limited Edition 2
- CD
01. UNLOCK
02.�GREATEST JOURNEY (*the opening theme song to�TBS' variety show "KAT-TUN no Sekaiichi Tame ni Naru Tabi!")
- DVD
"GREATEST JOURNEY" Video Clip + Making-of

Standard Edition
- CD only
01. UNLOCK
02. GREATEST JOURNEY
03. Unknown Title B
04. Unknown Title C
05. UNLOCK (Original Karaoke)
06. GREATEST JOURNEY (Original Karaoke)

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Source: natalie