April Fools' Day music pack [Legends of Muse Warriors] features 6 new songs and a bonus one [P E R O P E R O兄✰貴✰乱✰舞（feat.音游部, howsoon） - Mrguai]. Unlock it to obtain Warrior forms (permanent), 1 illustration, 1 brand-new title screen, and a full set of warrior support SET including special hit sound effects.
The new songs [Ré:Ré - モリモリあつし vs. uma] and [How To Make 音ゲ～曲! - F Rabbeat feat.マスタード] have the hidden sheets. [AlterLuna - BlackY] included in the MD Plus Project is also added with one. It's so dangerous out there. I'm gonna hide myself inside the hidden sheet (´；ω；`)
