THE IDOLM@STER MILLION BATTLE OF THE@TER EX04 is released! The fourth installment of the BATTLE OF THE@TER EX series! The exhibition-performance songs from the in-game event "BATTLE OF THEATER" of the app game "The Idolmaster Million Live! Theater Days" are released! Contains the title track "Stick to my weapon" + Off Vocal and a drama part that can only be heard on the CD. The booklet features many setting documents of this in-game event! Newly drawn illustration jacket.