X-tra BEST

 is the first best album of X4. It will be released on July 17.

Album Information

 * The album is released in 4 types:
 * 2 CD Regular Edition
 * 1 CD + 1 Blu-ray Limited Edition A
 * 1 CD + 1 Blu-ray Limited Edition B
 * CD Extra Price Edition
 * Catalog Number:

CD(A)

 * 1) Killing Me
 * 2) #musicoverdose -X4 ver.-
 * 3) Party Up!!
 * 4) obsession
 * 5) IDKYN（I don't know your name）
 * 6) Koe ni shita nara (声にしたなら)
 * 7) Snow Flakes
 * 8) Dive into your love
 * 9) Rainbow Road
 * 10) Pride
 * 11) Future, Super Duper, Nova
 * 12) Little Longer
 * 13) Kizuna (キズナ)
 * 14) FIRE
 * 15) i want you back

CD(B)

 * 1) Rockinʼ It
 * O
 * 1) Bang A Gong
 * 2) Once More Dance
 * 3) Heaven
 * 4) Saigo no Kotoba (最後の⾔葉)
 * 5) Attention Please
 * 6) Mikazuki (三⽇⽉)
 * 7) I'll give you all my life
 * 8) Fillinʼme with your love
 * 9) Last Scene (ラストシーン)
 * 10) Let Me Love You Down
 * 11) Guilty Love
 * 12) Coz I love you
 * 13) Song 4 you

Blu-ray

 * LIVE TOUR 2018 CROSSROAD Live Video (20181228)
 * MV Compilation #1
 * Koe ni shita nara (声にしたなら)
 * Killing Me
 * obsession
 * IDKYN（I don't know your name）
 * Party Up!!
 * Rainbow Road
 * Pride
 * Future, Super Duper, Nova
 * Little Longer
 * Will You Marry Me