Shoujo X

 is the first album by X21. It was released on April 29, 2015, and peaked at #21 on the Oricon album chart.

CD Only / Digital Editions

 * 1) Overture
 * 2) Shoujo X (少女X)
 * 3) GO! GO! X21 ~Dokidoki Hatsu Toukou~ (GO! GO! X21~ドキドキ初登校~)
 * 4) Chime Nattara... (チャイム鳴ったら...)
 * 5) Sekigae Wink (席替えウインク)
 * 6) Ashita e no Sotsugyou (明日への卒業)
 * 7) Koi suru Natsu! (恋する夏!)
 * 8) Happy Appli (ハッピーアプリ)
 * 9) X Gift (Xギフト)
 * 10) Kiyomi Song (キヨミ・ソング)
 * 11) Tsurakunai yo (ツラくないよ)
 * 12) Best Friend
 * 13) Material Girl (マテリアルガール)

CD+DVD Edition

 * 1) Overture
 * 2) Shoujo X (少女X)
 * 3) GO! GO! X21 ~Dokidoki Hatsu Toukou~ (GO! GO! X21~ドキドキ初登校~)
 * 4) Chime Nattara... (チャイム鳴ったら...)
 * 5) Sekigae Wink (席替えウインク)
 * 6) Ashita e no Sotsugyou (明日への卒業)
 * 7) Koi suru Natsu! (恋する夏!)
 * 8) Happy Appli (ハッピーアプリ)
 * 9) X Gift (Xギフト)
 * 10) Kiyomi Song (キヨミ・ソング)
 * 11) Tsurakunai yo (ツラくないよ)
 * 12) Best Friend

DVD

 * 1) Shoujo X (MUSIC VIDEO)
 * 2) Ashita e no Sotsugyou (MUSIC VIDEO Special Long Version)
 * 3) Koi suru Natsu! (MUSIC VIDEO)
 * 4) Happy Appli (MUSIC VIDEO)
 * 5) X Gift (MUSIC VIDEO)
 * 6) Kiyomi Song (Dance Video)
 * 7) Best Friend (MUSIC VIDEO)
 * 8) Shoujo X (MUSIC VIDEO Off-shot)
 * 9) 2014.9.20 First Time in Osaka LIVE Happy Jam in Osaka BEST SELECTION