I: Wish You Were Here

Yuji fights infected creatures with a military unit whose nanomachines generate protective armor around its soldiers. As the alien-borne virus changes, the defenses that once gave them an advantage become increasingly uncertain.

His encounter with Ai introduces him to another answer to the epidemic: a girl whose extraordinary ability has made her central to a secret project. Their growing bond is tested by experiments, divided loyalties, and authorities more interested in their usefulness than in the people behind their powers.