テロ組織ムンドの最高指導者ヴィンスがフィリピンを出国したとの情報を得た羽柴たち。潜伏先が特定できない中、唯一の手掛かりは三か月前に失踪したウイルス学の世界的権威、御薬袋教授の行方。鍵は筑波にあると考えた羽柴たちは御薬袋教授の研究チームが入っている研究施設へと向かう。しかし、そこは蟻一匹入れないほどのセキュリティシステムで守られた要塞で
Hashiba and the others get information that Vince, the leader of the terrorist organization Mundo, has left the Philippines. While the hiding place cannot be identified, the only clue is the whereabouts of Professor Oyakubukuro, a world authority on virology, who disappeared three months ago. Thinking that the key lies in Tsukuba, Hashiba and the others head to the research facility where Professor Oyakubukuro's research team is located. However, it is a fortress protected by a security system that even an ant cannot enter.
