Yoshiyuki Otomo operates within a freelance espionage unit monitoring corporate ventures on a lunar colony, driven by unresolved trauma from a fire that killed his lover, Yayoi Okina, and cost him his right arm—replaced by a specialized cybernetic prosthetic. Yayoi’s cryptic final words, hinting at a lunar reunion, echo as a persistent undercurrent in his purpose. The prosthetic arm proves indispensable to his mission, engineered to withstand corrosive substances essential for dismantling the Sleeper, an alien entity unearthed by lunar corporations that endangers humanity.

During operations, Yoshiyuki encounters Ines, a genetic replica of Yayoi tied to the Sleeper’s cloned network. Her revelation of his destined role in neutralizing the threat intertwines his personal loss with the colony’s survival. His emotional journey grapples with mourning Yayoi while confronting her clones, ethical dilemmas manifesting in fragmented flashbacks and dreams that contrast his otherwise duty-bound resolve. Team interactions remain tactically focused, emphasizing pragmatic collaboration over personal bonds.

Investigations expose the Sleeper’s origins among ancient extraterrestrial observers embroiled in cyclical conflicts over humanity’s trajectory. Yoshiyuki’s prosthetic, designed to disrupt the entity’s DNA, culminates in a decisive clash that neutralizes the threat. While the arm’s precise functionality remains undetailed, its success leaves unresolved questions regarding its creation and the broader consequences of the Sleeper’s eradication, anchoring lingering enigmas within the narrative’s closure.