title: X21 (group)
text: # X21 (group)
  
  X21 (次世代ユニットX21, Jisedai Yunitto Ekkusu Nijūichi) was a Japanese girl idol group. It was formed in 2013 of 21 finalists (with the average age of 14 years) of the 13th Japan Bishōjo Contest and is affiliated to the entertainment company Oscar Promotion.
  
  ## Members
  
  ### Former members
  
  * Mai Suenaga (末永 真唯)
  * Koharu Yamaki (山木 コハル)
  * Mami Nagao (長尾 真実)
  * Shuri Tanaka (田中 珠里)
  * Hasumi Shiritori (白鳥 羽純)
  * Rina Matsuda (松田 莉奈)
  * Honoka Kaminaguchi (上水口 萌乃香)
  * Nanaka Ozawa (小澤 奈々花)
  * Sakura Komoriya (籠谷 さくら)
  * Sāya Yamasaki (山﨑 紗彩)
  * Ichika Osaki (尾碕 真花)
  * Manami Igashira (井頭 愛海)
  * Yūka Takamura (髙村 優香)
  * Hikaru Katogaki (門垣 ひかる)
  * Mika Iijima (飯島 未賀)
  * Yurina Kawaguchi (川口 ゆりな)
  * Megumi Nakazato (中里 萌)
  * Shiori Inuzuka (犬塚 しおり)
  * Moe Fujie (藤江萌)
  * Misaki Nishikawa (西川 美咲)
  * Ayano Wakayama (若山 あやの)
  * Miyu Sagawa (佐川 実優)
  * Runa Takahashi (高橋 るな)
  * Yurika Hosoi (細井 友里加)
  * Misaki Sera (瀬羅 美咲)
  * Aguri Ōnishi (大西 亜玖璃)
  * Miho Izumikawa (泉川 実穂)
  * Miyu Yoshimoto (吉本 実憂)
  
  ## Discography
  
  ### Studio albums
  
  | No. | Title | Album details | Peaks | Peaks |
  | - | - | - | - | - |
  | No. | Title | Album details | JPN | JPN Hot. |
  | 1 | Shōjo X (少女X) | Released: April 29, 2015 (2015-04-29) Label: Avex Trax Format(s): CD, CD+DVD, digital download | 21 | — |
  | 2 | Beautiful X | Released: March 15, 2017 (2017-03-15) Label: Avex Trax Format(s): CD+VR, CD+Blu-ray, digital download | 20 | 40 |
  | "—" denotes items which failed to chart. |||||
  
  ### Singles
  
  | No. | Title | Release date | Peaks | Peaks | Album |
  | - | - | - | - | - | - |
  | No. | Title | Release date | JPN | JPN Hot. | Album |
  | 1 | "Asu e no Sotsugyō" (明日への卒業) | March 19, 2014 (2014-03-19) | 15 | 100 | Shōjo X |
  | 2 | "Koisuru Natsu!" (恋する夏!) | June 25, 2014 (2014-06-25) | 9 | — | Shōjo X |
  | 3 | "Happy Appli" (ハッピーアプリ) | September 24, 2014 (2014-09-24) | 11 | — | Shōjo X |
  | 4 | "X Gift" (Xギフト) | December 3, 2014 (2014-12-03) | 21 | — | Shōjo X |
  | 5 | "You-ki no Parade" (YOU-kIのパレード) | September 23, 2015 (2015-09-23) | 5 | — | Beautiful X |
  | 6 | "Magical☆Kiss" (マジカル☆キス) | December 2, 2015 (2015-12-02) | 10 | — | Beautiful X |
  | 7 | "Yakusoku no Oka" (約束の丘) | March 30, 2016 (2016-03-30) | 10 | 54 | Beautiful X |
  | 8 | "Natsu dayo!!" (夏だよ!!) | July 27, 2016 (2016-07-27) | 15 | 30 | Beautiful X |
  | 9 | "Kagami no Naka no Parallel Girl" (鏡の中のパラレルガール) | December 21, 2016 (2016-12-21) | 12 | 42 | Beautiful X |
  | 10 | "Genjitsu kara Nigeru kara Genjitsu ga Tsurainda" (現実から逃げるから現実がツラいんだ) | August 16, 2017 (2017-08-16) | 6 | 30 | Non-album single |
  | 11 | Friday Night Party | March 14, 2018 (2018-03-14) | 9 | 29 | Non-album single |
  | 12 | Destiny | September 19, 2018 (2018-09-19) | 8 | — | Non-album single |
  | "—" denotes items which failed to chart. ||||||
  
  ## Music videos
  
  | Year | Title |
  | - | - |
  | 2014 | "Asu e no Sotsugyō"] (YouTube Special MV) |
  | 2014 | "Gwiyomi Song" (キヨミ・ソング) |
  | 2014 | "Koisuru Natsu!" |
  | 2014 | "Happy Appli" |
  | 2014 | "Xギフト" |
  | 2015 | "Shōjo X" |
  | 2015 | "YOU-kI no Parade" |
  | 2015 | "Magical☆Kiss" |
  | 2016 | "Yakusoku no Oka" |
  | 2016 | "Natsu dayo!!" |
  | 2016 | "Kagami no Naka no Parallel Girl" |
  | 2017 | "Beautiful X" |
  | 2017 | "Genjitsu kara Nigeru kara Genjitsu ga Tsurainda |
  