Millennia before Sora and Shiro made their mark on Disboard’s history, the world was engulfed in conflict, with battles ravaging the skies, obliterating celestial bodies, and endangering the very existence of humankind. In the midst of this turmoil, a young leader named Riku strives to guide humanity toward a future he envisions. During his journey, he encounters Shuvi, a female “Ex-machina” android cast out from her kind, amidst the remnants of an Elf city. She seeks Riku’s help to understand the essence of having a human heart.