Yayoi, the deceased girlfriend of protagonist Yoshiyuki Otomo, perished on Earth before the story’s events, leaving a profound emotional void that drives his actions. Her cryptic final words, hinting at a lunar reunion, foreshadow his discovery of clones mirroring her likeness during a mission to expose corporate experiments on the moon.

These clones, genetic replicas forged by an alien entity called Darkness through fusion with human DNA, serve conflicting roles. Among them, Ines claims to embody Yayoi’s essence, displaying pacifism distinct from her aggressive counterparts aligned with Darkness. Identical in appearance and attire to Yayoi, the clones blur reality for Yoshiyuki, fueling his psychological turmoil as he grapples with their uncertain ties to her memory.

Subtle narrative threads suggest Yayoi’s life may have intersected with Darkness’s influence, though the nature of their connection remains enigmatic. A pivotal promise she shared with Yoshiyuki—linked to his cybernetic arm—later emerges as a key weapon against Darkness, though the origins of its significance linger in ambiguity.

The clones’ presence and Yayoi’s lingering legacy propel the clash against extraterrestrial forces and corporate intrigue, intertwining themes of grief, identity, and unresolved love through Yoshiyuki’s journey to reconcile loss with purpose.