As the outbreaks of the M34 virus continue to worsen, the NOA soldiers face strengthening opposition. The virus continues to evolve, adapting itself against the nanotechnology, turning the very advantages of the NOA soldiers against themselves. The bond between Yuuji and Ai will be put to the test as the threat of the M34 virus brings havoc and death all around them.

Episode 3 - Notice: The NOA soldiers return to home base to begin what they think is a break from the action. One by one, they begin to show symptoms of being infected, except for Yuuji. A new strain of the M34 begins to emerge, bringing the NOA soldiers face-to-face with this new threat.

Episode 4 - Presence: As the virus outbreak grows out of control, Yuuji slowly recovers from his injuries from before. In the face of growing danger, Yuuji begins to realize how much she means to him. Yuuji races to the aid of Ai as he leads the remaining armed forces against the new mutations...