A fan of the Gundam franchise since childhood, lead guitarist Sugizo was in charge of all of the anime's theme songs.

After discussions with the staff and Sugizo, he borrowed scripts from the show, watched videos over and over, and wrote down words that caught his attention.

[4] The music video for "Sora no Uta ~Higher and Higher~" utilizes footage from the anime as its lyrics feature connections to the fictional world of Gundam.

[5] A different music video for the song using footage of the band performing it live at the Nippon Budokan was also released.

Two additional versions of the limited editions were sold exclusively via the Universal Music Store and include a T-shirt of their cover illustrations, with Limited Edition A also including a DVD of the music video for "Sora no Uta ~Higher and Higher~".