第 4 集: 病毒爆發升級，悠二康復並意識到愛的重要性

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

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