Mikakunin Chuugakusei X

 is the fifth major single (11th overall) by Shiritsu Ebisu Chuugaku. It was released on November 20, 2013, and peaked at #4 on the Oricon single chart.

Regular Edition CD

 * 1) Mikakunin Chuugakusei X (未確認中学生X)
 * 2) U.B.U.
 * 3) Thanks! Merry Christmas K
 * 4) Mikakunin Chuugakusei X (未確認中学生X) (Less Vocal)
 * 5) U.B.U. (Less Vocal)
 * 6) Thanks! Merry Christmas K (Less Vocal)

Limited Edition A CD

 * 1) Mikakunin Chuugakusei X (未確認中学生X)
 * 2) U.B.U.
 * 3) I'm your MANAGER!!!
 * 4) Mikakunin Chuugakusei X (未確認中学生X) (Less Vocal)
 * 5) U.B.U. (Less Vocal)
 * 6) I'm your MANAGER!!! (Less Vocal)

Limited Edition B CD

 * 1) Mikakunin Chuugakusei X (未確認中学生X)
 * 2) U.B.U.
 * 3) Tsukatte Portfolio (使ってポートフォリオ)
 * 4) Mikakunin Chuugakusei X (未確認中学生X) (Less Vocal)
 * 5) U.B.U. (Less Vocal)
 * 6) Tsukatte Portfolio (使ってポートフォリオ) (Less Vocal)